Make getBootDisplayModeSupport feature optional in aidl composer

Bug: 216113429
Test: m
Test: atest libsurfaceflinger_unittest
Test: atest libcompositionengine_test
Test: Tested manually on cuttlefish (target with APIs implemented)
Change-Id: Ia949a375aabc12896115e99d4d11ad6fe0d0cf87
7 files changed