mx25 clocks: Fix MXC_FEC_CLK

mxc_get_clock(MXC_FEC_CLK) should return the IPG clock, not the AHB clock.

Also, imx_get_fecclk() was correct but reimplemented the calculation of the IPG
clock, so remove the duplicated code.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/arm926ejs/mx25/generic.c

@@ -129,9 +129,8 @@ unsigned int mxc_get_clock(enum mxc_clock clk)
 		return imx_get_ahbclk();
 	case MXC_IPG_CLK:
 	case MXC_CSPI_CLK:
-		return imx_get_ipgclk();
 	case MXC_FEC_CLK:
-		return imx_get_ahbclk();
+		return imx_get_ipgclk();
 	default:
 		return imx_get_perclk(clk);
 	}

arch/arm/include/asm/arch-mx25/clock.h

@@ -71,7 +71,7 @@ ulong imx_get_perclk(int clk);
 ulong imx_get_ahbclk(void);
 
 #define imx_get_uartclk() imx_get_perclk(15)
-#define imx_get_fecclk() (imx_get_ahbclk()/2)
+#define imx_get_fecclk() mxc_get_clock(MXC_FEC_CLK)
 
 unsigned int mxc_get_clock(enum mxc_clock clk);