mediatek/mt8183: Set CPU frequency to 1989MHz

Set CPU frequency from 1100MHz to 1989MHz to improve booting time.

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

Change-Id: Id41c7ea8905c4db2537a5c32f96eb7c6b2c008ea
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32397
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: You-Cheng Syu <youcheng@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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

@@ -244,7 +244,7 @@ enum {
 
 /* PLL rate */
 enum {
-	ARMPLL_LL_HZ	= 1100 * MHz,
+	ARMPLL_LL_HZ	= 1989 * MHz,
 	ARMPLL_L_HZ	= 1200 * MHz,
 	CCIPLL_HZ	= 598 * 2 * MHz,
 	MAINPLL_HZ	= 1092 * MHz,