MAINTAINERS: remove ANDROID ION pattern

The file drivers/staging/android/uapi/ion_test.h was removed by commit
9828282 ("staging: android: ion: Remove old platform support")

Remove the pattern.

Link: http://lkml.kernel.org/r/182debec22002c9a1de44e79a7441288942b205c.1517147485.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -903,7 +903,6 @@ L:	devel@driverdev.osuosl.org
 S:	Supported
 F:	drivers/staging/android/ion
 F:	drivers/staging/android/uapi/ion.h
-F:	drivers/staging/android/uapi/ion_test.h
 
 AOA (Apple Onboard Audio) ALSA DRIVER
 M:	Johannes Berg <johannes@sipsolutions.net>