usb: improve the usb performance of adb push/pull file

usb: improve the usb performance of adb push/pull file

BZ: 24941

The usb performance is low when adb push/pull files to/from PR3 phone.

The reason is that USB interrupt is delayed by OTG device controller.
USB interrupt interval is controlled by USBCMD.ITC. The default value
of ITC is a little high. Set ITC to low value to shorten interrupt
interval.

Change-Id: I85577648e5d0844aaf05ed343c393cad5619f375
Signed-off-by: wu xia <xia.wu@intel.com>
Reviewed-on: http://android.intel.com:8080/39931
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Tested-by: Sun, Jianhua <jianhua.sun@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>