dt-bindings: clock: rk3036: add SCLK_USB480M clock-id

Contrary to how it is implemented right now, the usb480m clock is a
controllable mux that can switch between the 24MHz oscillator and the
clock output of the usb2phy.

Add the needed clock-id to allow setting this mux from DT.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20250503202532.992033-2-heiko@sntech.de

Author: mmind

include/dt-bindings/clock/rk3036-cru.h

@@ -47,6 +47,7 @@
 #define SCLK_MACREF		152
 #define SCLK_MACPLL		153
 #define SCLK_SFC		160
+#define SCLK_USB480M		161
 
 /* aclk gates */
 #define ACLK_DMAC2		194