MAINTAINERS: add co-maintainer for scripts/gdb

Add myself as a co-maintainer for scripts/gdb supporting Jan Kizka

Link: http://lkml.kernel.org/r/fb5d34ce563f33d2f324f26f592b24ded30032ee.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Kieran Bingham <kieran@bingham.xyz>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -4859,6 +4859,7 @@ F:	drivers/scsi/gdt*
 
 GDB KERNEL DEBUGGING HELPER SCRIPTS
 M:	Jan Kiszka <jan.kiszka@siemens.com>
+M:	Kieran Bingham <kieran@bingham.xyz>
 S:	Supported
 F:	scripts/gdb/