Added initial HIDL interface for the biometric face HAL.

Notes:
- Added a basic interface, a stub callback interface and a stubs for
  needed public types.
- Ran make hidl-gen -j64 && hardware/interfaces/update-makefiles.sh
  to create build files for the interface.

Bug: 79577138
Test: None added. This commit simply adds a new interface.
Change-Id: I14b7238dd9ee1076f77c1b60117bdaa156a4f0f5