usb: dwc2: gadget: Fixes for StsPhseRcvd interrupt

The StsPhseRcvd interrupt should not be enabled in slave mode.

Also move the StsPhsRcvd interrupt checking in the endpoint interrupt
handler to the correct order according to the databook. The interrupt
itself will be implemented in a later commit.

Signed-off-by: Vahram Aharonyan <vahrama@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>