samsung: mmc: Drop old MMC init code

Now that these boards use driver model we can drop the old code. At
present s5p_mmc_init() is still used by goni and smdkv310 so cannot be
removed unless we remove those boards.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/mach-exynos/include/mach/mmc.h

@@ -64,6 +64,4 @@ static inline int s5p_mmc_init(int index, int bus_width)
 	return s5p_sdhci_init(base, index, bus_width);
 }
 
-int exynos_mmc_init(const void *blob);
-
 #endif