ARM: imx: Remove mx508 support

Only mx508 based board is mach-mx50_rdp and it has been marked as BROKEN
for several releases.

mx508 currently lacks clock support.

In case someone needs to add mx508 support back, then the recommended approach
is to use device tree.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/devices/platform-fec.c

@@ -35,12 +35,6 @@ const struct imx_fec_data imx35_fec_data __initconst =
 	imx_fec_data_entry_single(MX35, "imx27-fec");
 #endif
 
-#ifdef CONFIG_SOC_IMX50
-/* i.mx50 has the i.mx25 type fec */
-const struct imx_fec_data imx50_fec_data __initconst =
-	imx_fec_data_entry_single(MX50, "imx25-fec");
-#endif
-
 #ifdef CONFIG_SOC_IMX51
 /* i.mx51 has the i.mx27 type fec */
 const struct imx_fec_data imx51_fec_data __initconst =