MAINTAINERS: Update maintainer for USB xHCI

As discussed with Marek, this adds myself as the maintainer to
offload the USB xHCI part.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2a20b94..41c881f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -452,6 +452,12 @@
 T:	git git://git.denx.de/u-boot-usb.git
 F:	drivers/usb/
 
+USB xHCI
+M:	Bin Meng <bmeng.cn@gmail.com>
+S:	Maintained
+T:	git git://git.denx.de/u-boot-usb.git topic-xhci
+F:	drivers/usb/host/xhci*
+
 VIDEO
 M:	Anatolij Gustschin <agust@denx.de>
 S:	Maintained