drm_hwcomposer: Initial composer@2.4 HAL support

Enough to boot Android with composer@2.4 enabled.

VTS at this point:
============================================
================= Results ==================
    arm64-v8a VtsHalGraphicsComposerV2_4TargetTest: 34s
    armeabi-v7a VtsHalGraphicsComposerV2_4TargetTest: 31s
=============== Summary ===============
2/2 modules completed
Total Tests       : 46
PASSED            : 44
FAILED            : 2
============================================

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
1 job for composer_2_4_support in 30 seconds (queued for 1 second)