Exynos: Clock: Fix exynos5_get_periph_rate for I2C.

Commit 2e82e925 'Exynos: Clock: Cleanup
soc_get_periph_rate' introduced a bug in I2C config. This patch makes cros_ec
keyboard working again on Samsung Chromebook (snow).

Changes in V2: reorder lines as requested by Joonyoung Shim.
Signed-off-by: NGuillaume GARDET <guillaume.gardet@free.fr>
Cc: Akshay Saraswat <akshay.s@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Reviewed-by: NSimon Glass <sjg@chroimum.org>
Tested-by: NSimon Glass <sjg@chroimum.org>
Signed-off-by: NMinkyu Kang <mk7.kang@samsung.com>

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

@@ -423,8 +423,8 @@ static unsigned long exynos5_get_periph_rate(int peripheral)
 	case PERIPH_ID_I2C6:
 	case PERIPH_ID_I2C7:
 		src = EXYNOS_SRC_MPLL;
-		div = readl(&clk->div_top0);
-		sub_div = readl(&clk->div_top1);
+		div = readl(&clk->div_top1);
+		sub_div = readl(&clk->div_top0);
 		break;
 	default:
 		debug("%s: invalid peripheral %d", __func__, peripheral);