Camera: Ignore buffer handle 'int' section

Bufer handle hashing and comparison currently uses the buffer
'Int' section along with the Fd section. However the values there
can dynamically change after the buffer gets allocated which will
introduce side-effects in the buffer id map.

Bug: 37257356
Test: Complete Camera/Camera2 CTS
Change-Id: I2cf09ced69f155285dae67b3a2502e6b87f7d9cc