NPUW: Fix BF16 tensor collision in weight bank in new LLM pipeline #42422

Job	Run time
Smart_CI	20s
Docker	42s
Build / Build	6m 2s
Debian Packages	0s
PyTorch Models tests	0s
OpenVINO JS API / OpenVINO JS API	6m 22s
C++ unit tests / C++ unit tests	15m 16s
CPU functional tests / CPU functional tests	8m 59s
ONNX Runtime Integration / ONNX Runtime Integration	4m 12s
JAX Layer Tests / JAX Layer Tests	1m 26s
OpenVINO tokenizers extension / OpenVINO tokenizers extension	4m 11s
Samples / Samples	7m 35s
Python API tests / Python API tests	4m 58s
Python unit tests / Python unit tests	2m 40s
Pytorch Layer Tests / PyTorch Layer Tests	2m 36s
TensorFlow Models tests	0s
TensorFlow Layer Tests / TensorFlow Layer Tests	3m 57s
ci/gha_overall_status_linux_arm64	1s
	1h 9m 17s

Provide feedback