clk: rockchip: add clock ID for usbphy480m_src

There are 3 different parent clock from different usbphy,
all of them are fixed 480MHz, it is not able to auto select
by clock core to the 2nd and the 3rd parent.
For different use case for different board, we may need to
select different usbphy clock out as parent manually.

Add the clock ID for it so that we can use in dts.
Signed-off-by: NKever Yang <kever.yang@rock-chips.com>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>

include/dt-bindings/clock/rk3288-cru.h

@@ -80,6 +80,7 @@
 #define SCLK_SDIO0_SAMPLE	119
 #define SCLK_SDIO1_SAMPLE	120
 #define SCLK_EMMC_SAMPLE	121
+#define SCLK_USBPHY480M_SRC	122
 
 #define DCLK_VOP0		190
 #define DCLK_VOP1		191