MAINTAINERS: kunit: add platform mocking paths

Add paths for platform mocking stuff to list of paths under KUnit entry.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Change-Id: Ia8b58649486e87965050a552dca00be0a47e3e77

MAINTAINERS

diff --git a/MAINTAINERS b/MAINTAINERS
index 8c9b56d..9330d5e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7994,6 +7994,11 @@
 W:	https://google.github.io/kunit-docs/third_party/kernel/docs/
 S:	Maintained
 F:	Documentation/kunit/
+F:	arch/um/include/asm/io-mock-shared.h
+F:	arch/um/include/asm/io-mock.h
+F:	arch/um/kernel/io-mock.c
+F:	drivers/base/platform-mock.c
+F:	include/linux/platform_device_mock.h
 F:	include/kunit/
 F:	kunit/
 F:	tools/testing/kunit/