phy: marvell: a3700: Access USB3 register indirectly on lane 2

When USB3 is on comphy lane 2 on the Armada 37xx, the registers
have to be accessed indirectly via SATA indirect access.

This is the case of the Turris Mox board from CZ.NIC.

Signed-off-by: Marek Behun <marek.behun@nic.cz>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/phy/marvell/comphy_a3700.h b/drivers/phy/marvell/comphy_a3700.h
index 0d7b425..07f4792 100644
--- a/drivers/phy/marvell/comphy_a3700.h
+++ b/drivers/phy/marvell/comphy_a3700.h
@@ -59,6 +59,7 @@
 #define USB2PHY2_BASE			MVEBU_REG(0x05F000)
 #define USB32_CTRL_BASE			MVEBU_REG(0x05D800)
 #define USB3PHY_SHFT			2
+#define USB3PHY_LANE2_REG_BASE_OFFSET	0x200
 
 static inline void __iomem *sgmiiphy_addr(u32 lane, u32 addr)
 {