MAINTAINERS: add kexec@ list to LIVE UPDATE ENTRY

Link: https://lore.kernel.org/20260428124833.1903302-3-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Pasha Tatashin <pasha.tatashin@soleen.com> 
Acked-by: Baoquan He <baoquan.he@linux.dev>
Cc: Dave Young <ruirui.yang@linux.dev>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: rppt

MAINTAINERS

@@ -14897,6 +14897,7 @@ LIVE UPDATE
 M:	Pasha Tatashin <pasha.tatashin@soleen.com>
 M:	Mike Rapoport <rppt@kernel.org>
 M:	Pratyush Yadav <pratyush@kernel.org>
+L:	kexec@lists.infradead.org
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux.git