Android: kill off {MESA_}ANDROID_VERSION defines aka Android 4.1 and older

The Android version defines are only needed for versions less than 4.2
which aren't really supported or tested.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>