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drm_hwcomposer: stop using pixel_stride

Roman Stratiienko requested to merge roman.stratiienko/drm-hwcomposer:stop-using-pixelstride into main 
    pixel_stride is used only to validate buffer when importing using
    GraphicBufferMapper::importBuffer() method.
    
    The problem is we can't always get this value from buffer_handle_t.
    Libdrm and MapperMetadata getters can only calculate this value based
    on byte stride and buffer format. But this calculation isn't always
    possible, which causes importBuffer() to fail.
    
    Instead we can use GrallocMapper::importBuffer() method,
    which doesn't require to validate the buffer.
    
    This commit is not compatible with Android-P.

Currently successfully tested on libdrm getter and Android-11.

Edited by Roman Stratiienko

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