GMAC: define clock ID used for GMAC

changes since v2:
1. remove SCLK_MAC_PLL
Signed-off-by: NRoger Chen <roger.chen@rock-chips.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -81,6 +81,9 @@
 #define SCLK_SDIO1_SAMPLE	120
 #define SCLK_EMMC_SAMPLE	121
 
+#define SCLK_MAC		151
+#define SCLK_MACREF_OUT		152
+
 #define DCLK_VOP0		190
 #define DCLK_VOP1		191