exynos5420: init APLL at 1800MHz

This initializes the APLL at 1800MHz.

Change-Id: I366bf4e75510847ab93d9c9f214a49c731cca08a
Reviewed-on: https://gerrit.chromium.org/gerrit/64745
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/4443
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/cpu/samsung/exynos5420/clock_init.c

@@ -65,7 +65,7 @@ void system_clock_init(void)
 
 	/* Set APLL */
 	writel(APLL_CON1_VAL, &clk->apll_con1);
-	val = set_pll(0xc8, 0x3, 0x1);
+	val = set_pll(225, 3, 0);	/* FOUT=1800MHz */
 	writel(val, &clk->apll_con0);
 	while ((readl(&clk->apll_con0) & PLL_LOCKED) == 0)
 		;