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
diff --git a/doc/git-mailrc b/doc/git-mailrc
index 556db0a..5a365cd 100644
--- a/doc/git-mailrc
+++ b/doc/git-mailrc
@@ -133,6 +133,7 @@
 alias spmi           uboot, mateusz
 alias ubi            uboot, hs
 alias usb            uboot, marex
+alias xhci           uboot, bmeng
 alias video          uboot, ag
 alias patman         uboot, sjg
 alias buildman       uboot, sjg