phy: qcom-usb-hs: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning
by explicitly adding a break statement instead of letting the code fall
through to the next case.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <[e-mail]>
Link: https://lore.kernel.org/r/20210305100219.GA142595@embeddedor
Signed-off-by: Vinod Koul <[e-mail]>

drivers/phy/qualcomm/phy-qcom-usb-hs.c

···
 			fallthrough;
 		case PHY_MODE_USB_DEVICE:
 			val |= ULPI_INT_SESS_VALID;
+			break;
 		default:
 			break;
 		}