android: mm: generic: Use GraphicBufferAllocator instead of gralloc.h

gralloc.h is a very old API that has been deprecated at least since
Android P (9).

Switch over to a higher level abstraction of gralloc from libui, which
is compatible with Android 11 and up.
Libui:
* is provided in the VNDK (so it's available to vendors).
* is also used in the camera vts test named VtsAidlHalCameraProvider_TargetTest.

Notes:
* GraphicsBufferAllocator being a Singleton, buffer lifecycle
  management is easier.
* The imported headers from Android generate the -Wextra-semi warning.
  To avoid patching the files, a pragma has been added before inclusion.
* libdl was used for dlclosing() the legacy hal, so the dep has been dropped

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

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