MAINTAINERS: add tree for KDUMP and KEXEC

MAINTAINERS: add tree for KDUMP and KEXEC

Patch series "MAINTAINERS: update KEXEC, KDUMP and LIVE UPDATE".

KHO and LiveUpdate team is going to pick kdump and kexec patches to
their tree at

https://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux.git

Update MAINTAINERS to reflect this change and add kexec@ list to LIVE
UPDATE entry.

This patch (of 2):

KHO and LiveUpdate team is going to pick kdump and kexec patches to their
tree at

https://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux.git

Update MAINTAINERS to reflect it.

Link: https://lore.kernel.org/20260428124833.1903302-1-rppt@kernel.org
Link: https://lore.kernel.org/20260428124833.1903302-2-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>
Acked-by: Pratyush Yadav <pratyush@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Dave Young <ruirui.yang@linux.dev>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>