Camera: remove flag use_system_api_for_vndk_version

Cleanup from removing use_system_api_for_vndk_version also
removes the flag  use_ro_board_api_level_for_vndk_version.

Bug: 365555385
Test: Build successfully, no logic change.
Flag: EXEMPT flag removal
Change-Id: I92270613adf195baff22e187ea4cd0f065c98437
2 files changed