soc/mediatek: Make timer_prepare() a common function

timer_prepare() is the same for MT8195 and MT8186, so move it to
common folder.

TEST=build pass
BUG=b:233720142

Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Change-Id: I91a6f4ecc665a058cb7a0ba96c15b27d6dc97d13
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65602
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Yidi Lin <yidilin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/mediatek/mt8186/Makefile.inc

@@ -5,7 +5,7 @@ all-y += ../common/flash_controller.c
 all-y += ../common/gpio.c gpio.c
 all-y += ../common/i2c.c i2c.c
 all-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
-all-y += ../common/timer.c timer.c
+all-y += ../common/timer.c ../common/timer_prepare.c
 all-y += ../common/uart.c
 
 bootblock-y += bootblock.c

src/soc/mediatek/mt8186/timer.c

@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-/*
- * This file is created based on MT8186 Functional Specification
- * Chapter number: 5.13
- */
-
-#include <device/mmio.h>
-#include <soc/addressmap.h>
-#include <soc/timer.h>
-
-void timer_prepare(void)
-{
-	clrbits32((void *)SYSTIMER_BASE, COMP_FEATURE_MASK);
-	setbits32((void *)SYSTIMER_BASE, COMP_25_MASK);
-}

src/soc/mediatek/mt8195/Makefile.inc

@@ -5,7 +5,7 @@ all-y += ../common/flash_controller.c
 all-y += ../common/gpio.c gpio.c
 all-y += ../common/i2c.c i2c.c
 all-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
-all-y += ../common/timer.c timer.c
+all-y += ../common/timer.c ../common/timer_prepare.c
 all-y += ../common/uart.c
 
 bootblock-y += bootblock.c