cameraserver: Fix stream specific HAL buffer manager for HIDL devices

Move use_hal_buf_manager assignment out of AIDL specific code so that
HIDL doesn't get incorrectly reset.

Bug: 324053126

Test: Vendor Testing
Test: CTS on AIDL camera HAL devices
Test: CTS on cuttlefish with session specific HAL buffer manager

Change-Id: I285beabe50dd679e78c49e7ea6e4a7541b18cace
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>