USB: xhci: Add Makefile, MAINTAINERS, and Kconfig entries.

Add Makefile and Kconfig entries for the xHCI host controller driver.
List Sarah Sharp as the maintainer for the xHCI driver.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/MAINTAINERS b/MAINTAINERS
index 2cb7566..6ade3a5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6164,6 +6164,12 @@
 S:	Maintained
 F:	drivers/net/wireless/rndis_wlan.c
 
+USB XHCI DRIVER
+P:	Sarah Sharp
+M:	sarah.a.sharp@intel.com
+L:	linux-usb@vger.kernel.org
+S:	Supported
+
 USB ZC0301 DRIVER
 P:	Luca Risolia
 M:	luca.risolia@studio.unibo.it