hw/uefi: add MAINTAINERS entry

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-ID: <20250225163031.1409078-24-kraxel@redhat.com>

MAINTAINERS

@@ -2820,6 +2820,12 @@ F: hw/misc/ivshmem-flat.c
 F: include/hw/misc/ivshmem-flat.h
 F: docs/system/devices/ivshmem-flat.rst
 
+UEFI variable service
+M: Gerd Hoffmann <kraxel@redhat.com>
+S: Maintained
+F: hw/uefi/
+F: include/hw/uefi/
+
 Subsystems
 ----------
 Overall Audio backends