mx25: Clean up clocks API

Use the standard mxc_get_clock() instead of exporting internal functions and
using literal constant values.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/include/asm/arch-mx25/clock.h b/arch/arm/include/asm/arch-mx25/clock.h
index a532da5..efbe038 100644
--- a/arch/arm/include/asm/arch-mx25/clock.h
+++ b/arch/arm/include/asm/arch-mx25/clock.h
@@ -67,12 +67,9 @@
 	MXC_CLK_NUM
 };
 
-ulong imx_get_perclk(int clk);
-ulong imx_get_ahbclk(void);
-
-#define imx_get_uartclk() imx_get_perclk(15)
-#define imx_get_fecclk() mxc_get_clock(MXC_FEC_CLK)
-
 unsigned int mxc_get_clock(enum mxc_clock clk);
 
+#define imx_get_uartclk()	mxc_get_clock(MXC_UART_CLK)
+#define imx_get_fecclk()	mxc_get_clock(MXC_FEC_CLK)
+
 #endif /* __ASM_ARCH_CLOCK_H */