gpu: ion: Clear GFP_WAIT flag on high order allocations

This will prevent the kernel from kicking off compaction
when higher order allocations are made.  Instead we will
get these high order allocations only if they are readily
available.

Change-Id: I5c038781ef4028c1c0a1a52b6cb549d26550a124
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>