arm: mach-omap2: Factor out common FDT fixup suport

Some of the fixups currently done for OMAP5 class boards are common to
other OMAP family devices, move these to fdt-common.c.

Signed-off-by: Andrew F. Davis <afd@ti.com>
diff --git a/arch/arm/mach-omap2/sec-common.c b/arch/arm/mach-omap2/sec-common.c
index f230c9e..030b36f 100644
--- a/arch/arm/mach-omap2/sec-common.c
+++ b/arch/arm/mach-omap2/sec-common.c
@@ -176,7 +176,7 @@
 	return result;
 }
 
-static u32 get_sec_mem_start(void)
+u32 get_sec_mem_start(void)
 {
 	u32 sec_mem_start = CONFIG_TI_SECURE_EMIF_REGION_START;
 	u32 sec_mem_size = CONFIG_TI_SECURE_EMIF_TOTAL_REGION_SIZE;