mediatek/mt8183: Set CPU frequency to 1417MHz

With the default CPU voltage (0.8v), CPU frequency should be 1417Mhz at
most. We have to raise CPU frequency to 1989MHz after increasing CPU
voltage to 1.05v in romstage.

BUG=b:80501386
BRANCH=none
Test=Boots correctly on Kukui

Change-Id: I4c3e0fa27ccda8e0efe422b6ab503a1efb1697e9
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32464
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/mediatek/mt8183/include/soc/pll.h

@@ -244,7 +244,7 @@ enum {
 
 /* PLL rate */
 enum {
-	ARMPLL_LL_HZ	= 1989 * MHz,
+	ARMPLL_LL_HZ	= 1417 * MHz,
 	ARMPLL_L_HZ	= 1200 * MHz,
 	CCIPLL_HZ	= 598 * 2 * MHz,
 	MAINPLL_HZ	= 1092 * MHz,