drm_hwcomposer: Propagate PLATFORM_SDK_VERSION to cflags

PLATFORM_SDK_VERSION is needed for already present
code (GetDisplayIdentificationData/GetDisplayCapabilities),
which implements some of the android.hardware.graphics.composer@2.3 API.

Signed-off-by: Andrii Chepurnyi <andrii_chepurnyi@epam.com>
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