usb: dwc3: core: fix cached revision on our structure

All our revision macros are defined with the entire
32-bits which we read from GSNPSID register, so we
must cache all 32-bits properly rather than masking
the top 16-bits.

This will fix all revision checks we have on current
driver.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 717ebc9..600d823 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -264,7 +264,7 @@
 		ret = -ENODEV;
 		goto err0;
 	}
-	dwc->revision = reg & DWC3_GSNPSREV_MASK;
+	dwc->revision = reg;
 
 	dwc3_core_soft_reset(dwc);