MAINTAINERS: add Danilo as FIRMWARE LOADER maintainer

Add myself as firmware loader maintainer, as suggested by Luis in [1].

CC: Luis Chamberlain <mcgrof@kernel.org>
CC: Russ Weight <russ.weight@linux.dev>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/rust-for-linux/ZnHkQpyiX4UKdLEt@bombadil.infradead.org/ [1]
Suggested-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://lore.kernel.org/r/20240619132029.59296-3-dakr@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -8569,6 +8569,7 @@ F:	include/linux/arm_ffa.h
 FIRMWARE LOADER (request_firmware)
 M:	Luis Chamberlain <mcgrof@kernel.org>
 M:	Russ Weight <russ.weight@linux.dev>
+M:	Danilo Krummrich <dakr@redhat.com>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 F:	Documentation/firmware_class/