MAINTAINERS: add "exec & binfmt" section with myself and Eric

I'd like more continuity of review for the exec and binfmt (and ELF)
stuff.  Eric and I have been the most active lately, so list us as
reviewers.

Link: https://lkml.kernel.org/r/20211006180200.1178142-1-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -7037,6 +7037,20 @@ F:	include/trace/events/mdio.h
 F:	include/uapi/linux/mdio.h
 F:	include/uapi/linux/mii.h
 
+EXEC & BINFMT API
+R:	Eric Biederman <ebiederm@xmission.com>
+R:	Kees Cook <keescook@chromium.org>
+F:	arch/alpha/kernel/binfmt_loader.c
+F:	arch/x86/ia32/ia32_aout.c
+F:	fs/*binfmt_*.c
+F:	fs/exec.c
+F:	include/linux/binfmts.h
+F:	include/linux/elf.h
+F:	include/uapi/linux/binfmts.h
+F:	tools/testing/selftests/exec/
+N:	asm/elf.h
+N:	binfmt
+
 EXFAT FILE SYSTEM
 M:	Namjae Jeon <linkinjeon@kernel.org>
 M:	Sungjong Seo <sj1557.seo@samsung.com>