MAINTAINERS: remove the obsolete file entry for staging in ANDROID DRIVERS

Commit 721412ed ("staging: remove ashmem") removes the last android
driver from staging, but misses to adjust MAINTAINERS.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Remove the obsolete file entry in ANDROID DRIVERS.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20220316124802.372-1-lukas.bulwahn@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -1259,7 +1259,6 @@ L:	linux-kernel@vger.kernel.org
 S:	Supported
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
 F:	drivers/android/
-F:	drivers/staging/android/
 
 ANDROID GOLDFISH PIC DRIVER
 M:	Miodrag Dinic <miodrag.dinic@mips.com>