phy: rockchip: add usbdp combo phy driver

This adds a new USBDP combo PHY with Samsung IP block driver.
The PHY is a combo between USB 3.0 and DisplayPort alt mode.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
[eugen.hristev@collabora.com: ported to 2023.07, clean-up]
Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/phy/rockchip/Makefile b/drivers/phy/rockchip/Makefile
index 25a803a..7fdbd10 100644
--- a/drivers/phy/rockchip/Makefile
+++ b/drivers/phy/rockchip/Makefile
@@ -9,3 +9,4 @@
 obj-$(CONFIG_PHY_ROCKCHIP_SNPS_PCIE3)	+= phy-rockchip-snps-pcie3.o
 obj-$(CONFIG_PHY_ROCKCHIP_TYPEC)	+= phy-rockchip-typec.o
 obj-$(CONFIG_PHY_ROCKCHIP_INNO_DSIDPHY)	+= phy-rockchip-inno-dsidphy.o
+obj-$(CONFIG_PHY_ROCKCHIP_USBDP) += phy-rockchip-usbdp.o