arm: exynos: clock: support SPLL as mmc source clock for exynos5420

MMC of exynos5420 can select SPLL as source clock, so add to support
SPLL in exynos5420_get_mmc_clk(). It was tested on Odroid-XU3 board.
Signed-off-by: NJoonyoung Shim <jy0922.shim@samsung.com>
Acked-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NMinkyu Kang <mk7.kang@samsung.com>

arch/arm/cpu/armv7/exynos/clock.c

@@ -848,6 +848,8 @@ static unsigned long exynos5420_get_mmc_clk(int dev_index)
 
 	if (sel == 0x3)
 		sclk = get_pll_clk(MPLL);
+	else if (sel == 0x4)
+		sclk = get_pll_clk(SPLL);
 	else if (sel == 0x6)
 		sclk = get_pll_clk(EPLL);
 	else