meta-quanta: add Brandon Kim to MAINTAINERS

Brandon has done high quality reviews of many recent meta-quanta
patches.

Change-Id: Ieea20a5d30e79cdaec89ef101bfa1e405a8ef30f
Signed-off-by: Benjamin Fair <benjaminfair@google.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index f309c56..d57c096 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -44,3 +44,4 @@
 
 M:  Benjamin Fair <benjaminfair@google.com> <benjaminfair!>
 M:  Samuel Jiang <Samuel.Jiang@quantatw.com> <samueljiang!>
+M:  Brandon Kim <brandonkim@google.com> <brandonk!>