checkpatch: update MAINTAINERS entry

Update my email address to my new work address.  Also, as per our recent
email conversation remove Randy and Joel from the maintainers list.
Finally add LKML so that emails are recorded somewhere.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Joel Schopp <jschopp@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -1092,11 +1092,8 @@ S:	Maintained
 
 CHECKPATCH
 P:	Andy Whitcroft
-M:	apw@shadowen.org
-P:	Randy Dunlap
-M:	rdunlap@xenotime.net
-P:	Joel Schopp
-M:	jschopp@austin.ibm.com
+M:	apw@canonical.com
+L:	linux-kernel@vger.kernel.org
 S:	Supported
 
 CISCO 10G ETHERNET DRIVER