fec_mxc: add MX25 support

Use RMII for MX25
Add code to init gasket that enables RMII

Signed-off-by: John Rigby <jcrigby@gmail.com>
CC: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/asm-arm/arch-mx25/clock.h b/include/asm-arm/arch-mx25/clock.h
index b0752e7..c59f588 100644
--- a/include/asm-arm/arch-mx25/clock.h
+++ b/include/asm-arm/arch-mx25/clock.h
@@ -30,6 +30,7 @@
 ulong imx_get_ahbclk(void);
 
 #define imx_get_uartclk() imx_get_perclk(15)
+#define imx_get_fecclk() (imx_get_ahbclk()/2)
 
 
 #endif /* __ASM_ARCH_CLOCK_H */