egl/android: Add support for YV12 pixel format (v2)

egl/android: Add support for YV12 pixel format (v2)

This patch adds support for YV12 pixel format to the Android platform
backend. Only creating EGL images is supported, it is not added to the
list of available visuals.

v2: Use const array defined just for YV12 instead of trying to be overly
    generic.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Kalyan Kondapally <kalyan.kondapally@intel.com>
Tested-by: Rob Herring <rob@kernel.org>
Reviewed-by: Chad Versace <chad@kiwitree.net>
Change-Id: I4aeb2d67a95c5cdd10b530c549b23146c8f0b983