omap: beagle_x15: add MAINTAINERS

Commit 1e4ad74b875f (beagle_x15: add board support for Beagle x15)
missed to add board/ti/beagle_x15/MAINTAINERS.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Felipe Balbi <balbi@ti.com>
diff --git a/board/ti/beagle_x15/MAINTAINERS b/board/ti/beagle_x15/MAINTAINERS
new file mode 100644
index 0000000..3f84def
--- /dev/null
+++ b/board/ti/beagle_x15/MAINTAINERS
@@ -0,0 +1,6 @@
+BEAGLE X15
+M:	Felipe Balbi <balbi@ti.com>
+S:	Maintained
+F:	board/ti/beagle_x15/
+F:	include/configs/beagle_x15.h
+F:	configs/beagle_x15_defconfig