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>

MAINTAINERS

@@ -452,6 +452,12 @@ S:	Maintained
 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

doc/git-mailrc

@@ -133,6 +133,7 @@ alias spi            uboot, jagan
 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