USB: switch maintainership of chipidea to Peter

Alexander isn't able to maintain the Chipidea code anymore, and as Peter
has been acting as the de-facto maintainer anyway, make it official.

Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Peter Chen <Peter.Chen@freescale.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -2137,7 +2137,8 @@ S:	Maintained
 F:	Documentation/zh_CN/
 
 CHIPIDEA USB HIGH SPEED DUAL ROLE CONTROLLER
-M:	Alexander Shishkin <alexander.shishkin@linux.intel.com>
+M:	Peter Chen <Peter.Chen@freescale.com>
+T:	git://github.com/hzpeterchen/linux-usb.git
 L:	linux-usb@vger.kernel.org
 S:	Maintained
 F:	drivers/usb/chipidea/