usb: dwc3: add dis_enblslpm_quirk

Add a quirk to clear the GUSB2PHYCFG.ENBLSLPM bit, which controls
whether the PHY receives the suspend signal from the controller.

Refer to commit ec791d149bca("usb: dwc3: Add dis_enblslpm_quirk")
in Linux Kernel.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/include/dwc3-uboot.h b/include/dwc3-uboot.h
index ecae34b..98d51e0 100644
--- a/include/dwc3-uboot.h
+++ b/include/dwc3-uboot.h
@@ -34,6 +34,7 @@
 	unsigned dis_u3_susphy_quirk;
 	unsigned dis_u2_susphy_quirk;
 	unsigned dis_del_phy_power_chg_quirk;
+	unsigned dis_enblslpm_quirk;
 	unsigned tx_de_emphasis_quirk;
 	unsigned tx_de_emphasis;
 	int index;