OMAP3: Remove get_mem_type prototype

This function doesn't exist for omap3

Signed-off-by: Tom Rini <trini@ti.com>

arch/arm/include/asm/arch-omap3/sys_proto.h

@@ -49,7 +49,6 @@ void set_muxconf_regs(void);
 u32 get_cpu_family(void);
 u32 get_cpu_rev(void);
 u32 get_sku_id(void);
-u32 get_mem_type(void);
 u32 get_sysboot_value(void);
 u32 is_gpmc_muxed(void);
 u32 get_gpmc0_type(void);