MAINTAINERS: Add "K:" pattern for trivial

Since scripts/get_maintainer.pl was updated to search content before the
patch by commit 7764dcb5 ("get_maintainer.pl: allow "K:" pattern tests to
match non-patch text") perhaps this might direct a few more patches the
right place.
Original-patch-by: NL. Alberto Gim?nez <agimenez@sysvalve.es>
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

MAINTAINERS

@@ -6215,6 +6215,7 @@ TRIVIAL PATCHES
 M:	Jiri Kosina <trivial@kernel.org>
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial.git
 S:	Maintained
+K:	^Subject:.*(?i)trivial
 
 TTY LAYER
 M:	Greg Kroah-Hartman <gregkh@suse.de>