drm_hwcomposer: Use GraphicBufferMapper for copy buffer handle

Merged Andrii Chepurnyi requested to merge andrii82/drm-hwcomposer:mr-use-mapper into master

Due to gralloc0/gralloc1 API incompatibility(register/unregister vs retain/release) it is preferred to use generic GraphicBufferMapper API for copy buffer handle. It will use an appropriate adapter for the present version of gralloc. For the reference: hardware/interfaces/graphics/mapper

Change-Id: Ia4740ed3b2ffd43fa3c107eb22d792eaabd4df40 Signed-off-by: Andrii Chepurnyi andrii_chepurnyi@epam.com

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