efi: Add a separate maintainer entry for the app

Separate this out slightly from the payload, with a new entry.

We might consider renaming EFI PAYLOAD to EFI LOADER, but that would
require quite a lot of file changes.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

MAINTAINERS

@@ -693,6 +693,13 @@ F:	drivers/core/
 F:	include/dm/
 F:	test/dm/
 
+EFI APP
+M:	Simon Glass <sjg@chromium.org>
+M:	Heinrich Schuchardt <xypron.glpk@gmx.de>
+S:	Maintained
+W:	https://u-boot.readthedocs.io/en/latest/develop/uefi/u-boot_on_efi.html
+F:	lib/efi/efi_app.c
+
 EFI PAYLOAD
 M:	Heinrich Schuchardt <xypron.glpk@gmx.de>
 R:	Alexander Graf <agraf@csgraf.de>