display: Remove framebuffer HAL usage

This patch removes the usage of the framebuffer HAL which is
deprecated in JB MR1 onwards. The code is left for compatibility
such as conformance tests but it is unused for normal display
usage.

Change-Id: If98133bdaa759cdc41d4503ff695b225ee43cb6f
gralloc: Enable framebuffer memory mapping.

Enable mapping from framebuffer if debug.gralloc.map_fb_memory
is set to 1. This is useful for bringup.

Change-Id: I3c860148729c5f5c98d84bf17e6633285b4b0af1