MAINTAINERS: assign test/py/tests/test_efi*/ to EFI PAYLOAD

Some UEFI related files are not assigned currently. Add them to the
EFI PAYLOAD area.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index dd92af5..66f0b07 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -625,6 +625,7 @@
 F:	lib/charset.c
 F:	lib/efi*/
 F:	test/py/tests/test_efi*
+F:	test/py/tests/test_efi*/
 F:	test/unicode_ut.c
 F:	cmd/bootefi.c
 F:	cmd/efidebug.c