dt-bindings: clock: Add AST2500 RMII RCLK definitions

The AST2500 has an explicit gate for the RMII RCLK for each of the two
MACs.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>

include/dt-bindings/clock/aspeed-clock.h

@@ -39,6 +39,8 @@
 #define ASPEED_CLK_BCLK			33
 #define ASPEED_CLK_MPLL			34
 #define ASPEED_CLK_24M			35
+#define ASPEED_CLK_MAC1RCLK		36
+#define ASPEED_CLK_MAC2RCLK		37
 
 #define ASPEED_RESET_XDMA		0
 #define ASPEED_RESET_MCTP		1