camera: Delete supportsCameraApi binder call

HAL1 support was removed in Android S. So, all devices are required
to support HAL3 and therefore the camera2 API. Camera1 API is always
supported - until removed.

Bug: 391957505

Flag: EXEMPT; bug fix

Test: Camera CTS

Change-Id: I80fae67c27cf2c9bebb8415cbf52574f7196141e
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>