MAINTAINERS: add Andrew and Baoquan as kexec maintainers

Add Andrew as kexec/kdump maintainer because he has been helping review
and merge ready kexec/kdump patches.

And I would like to nominate myself as kexec maintainer because I always
try to review generic kexec codes.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Baoquan He <[email protected]>
Acked-by: Dave Young <[email protected]>
Acked-by: Simon Horman <[email protected]>
Cc: Eric Biederman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Baoquan He

MAINTAINERS

@@ -12810,6 +12810,7 @@ F:	lib/Kconfig.kcsan
 F:	scripts/Makefile.kcsan
 
 KDUMP
+M:	Andrew Morton <[email protected]>
 M:	Baoquan He <[email protected]>
 R:	Vivek Goyal <[email protected]>
 R:	Dave Young <[email protected]>
@@ -13111,6 +13112,8 @@ F:	fs/kernfs/
 F:	include/linux/kernfs.h
 
 KEXEC
+M:	Andrew Morton <[email protected]>
+M:	Baoquan He <[email protected]>
 L:	[email protected]
 W:	http://kernel.org/pub/linux/utils/kernel/kexec/
 F:	include/linux/kexec.h