camera2: Add fwk-only tags for SCALER_CROP_REGION and metering regions.

Default sensor mode capture requests would have their scaler crop
regions set to the default active / pre-correction array coordinate
system. Cameraserver needs to correct this for max res sensor pixel mode CaptureRequests.
In order to facilitate the correction, we add fwk-only CaptureRequest tags which are set when camera
clients set SCALER_CROP_REGION / metering regions.

Bug: 194143991

Test: CTS

Change-Id: I66393a1e6310f149138be4799f20ced377b11eb4
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>