UPSTREAM: usb: dwc3: gadget: only resume USB2 PHY in <=HIGHSPEED

UPSTREAM: usb: dwc3: gadget: only resume USB2 PHY in <=HIGHSPEED

As a micro-power optimization, let's only resume the
USB2 PHY if we're working on <=HIGHSPEED. If we're
gonna work on SUPERSPEED or SUPERSPEED+, there's no
point in resuming the USB2 PHY.

Change-Id: I2661fcde935c6b20afbd54f7a9f74e1ebde2a0d0
Fixes: 2b0f11df84bb ("usb: dwc3: gadget: clear SUSPHY bit before ep cmds")
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
(cherry picked from commit ab2a92e7a608c09f13baf1730b9ba24c73c35d52)