add janga

Summary:
As title.  Also include montblanc in list of BMC lite platforms.  I'm
thinking the platforms.thrift sync script should auto-generate all this
stuff so it can be landed in the same commit but that's a bigger change.

Test Plan:
```
0 ~/local/openbmc/tools/flashy $ ./build.sh && ./build_dev.sh && go test ./...
?       github.com/facebook/openbmc/tools/flashy/flash_procedure        [no test files]
?       github.com/facebook/openbmc/tools/flashy/lib/logger     [no test files]
?       github.com/facebook/openbmc/tools/flashy/tests  [no test files]
?       github.com/facebook/openbmc/tools/flashy/utilities      [no test files]
ok      github.com/facebook/openbmc/tools/flashy        3.376s
ok      github.com/facebook/openbmc/tools/flashy/checks_and_remediations/bletchley      0.006s
ok      github.com/facebook/openbmc/tools/flashy/checks_and_remediations/common 0.377s
ok      github.com/facebook/openbmc/tools/flashy/checks_and_remediations/galaxy100      0.010s
ok      github.com/facebook/openbmc/tools/flashy/checks_and_remediations/wedge100       0.009s
ok      github.com/facebook/openbmc/tools/flashy/checks_and_remediations/yamp   0.008s
ok      github.com/facebook/openbmc/tools/flashy/install        0.008s
ok      github.com/facebook/openbmc/tools/flashy/lib/fileutils  0.013s
ok      github.com/facebook/openbmc/tools/flashy/lib/flash      0.010s
ok      github.com/facebook/openbmc/tools/flashy/lib/flash/flashcp      0.010s
ok      github.com/facebook/openbmc/tools/flashy/lib/flash/flashutils   0.008s
ok      github.com/facebook/openbmc/tools/flashy/lib/flash/flashutils/devices   0.009s
ok      github.com/facebook/openbmc/tools/flashy/lib/step       0.008s
ok      github.com/facebook/openbmc/tools/flashy/lib/utils      0.446s
ok      github.com/facebook/openbmc/tools/flashy/lib/validate   0.008s
ok      github.com/facebook/openbmc/tools/flashy/lib/validate/image     0.008s
ok      github.com/facebook/openbmc/tools/flashy/lib/validate/partition 0.028s
0 ~/local/openbmc/tools/flashy $
```

Reviewed By: kawmarco

Differential Revision: D52481796

fbshipit-source-id: 8545bcbd9a24888cf8c627be030d2b85fc33aad0

tools/flashy/flash_procedure/flash_janga.go

@@ -0,0 +1,30 @@
+
+/**
+ * Copyright 2020-present Facebook. All Rights Reserved.
+ *
+ * This program file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program in a file named COPYING; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ */
+
+package flash_procedure
+
+import (
+	"github.com/facebook/openbmc/tools/flashy/lib/flash"
+	"github.com/facebook/openbmc/tools/flashy/lib/step"
+)
+
+func init() {
+	step.RegisterStep(flash.FlashCp)
+}

tools/flashy/lib/utils/system.go

@@ -368,7 +368,7 @@ var IsLFOpenBMC = func() (bool) {
 // IsBMCLite check whether the system is running BMC-lite
 // For S368275.   Make this beautiful later.
 var IsBMCLite = func() (bool) {
-	magics := []string{"fbdarwin", "meru"}
+	magics := []string{"fbdarwin", "meru", "janga", "montblanc"}
 
 	issueBuf, err := fileutils.ReadFile(etcIssueFilePath)
 	if err != nil {