Fall back to RDMV1 if needed and possible

In cases where RDMV2 is flag-enabled but not a RDM state with
PROPERTY_FEATURE_REAR_DISPLAY_OUTER_DEFAULT is not found, fall
back to RDMV1 if it exists on the device.

Fixes: 393181436
Test: atest WindowAreaComponentImplTests
Flag: EXEMPT bugfix
Change-Id: Ia35425ed8f5ab763b8e245ad39984cb9fb3f06ee