soc/mediatek/mt8195: Enable and initialize eint

eint event mask register is used to mask eint wakeup source.
All wakeup sources are masked by default. Since most MediaTek SoCs do
not have this design, we can't modify the kernel eint upstream driver to
solve the issue 'Can't wake using power button (cros_ec) or touchpad'.
So we add a driver here to unmask all wakeup sources.

Change-Id: I703d87e3dc49cf4e0b7ff0c75a6ea80245dd73d3
Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54007
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/mediatek/mt8195/Makefile.inc

@@ -1,6 +1,7 @@
 ifeq ($(CONFIG_SOC_MEDIATEK_MT8195),y)
 
 bootblock-y += bootblock.c
+bootblock-y += ../common/eint_event.c
 bootblock-y += ../common/flash_controller.c
 bootblock-y += ../common/gpio.c gpio.c
 bootblock-y += ../common/i2c.c i2c.c

src/soc/mediatek/mt8195/bootblock.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <bootblock_common.h>
+#include <soc/eint_event.h>
 #include <soc/mmu_operations.h>
 #include <soc/pll.h>
 #include <soc/wdt.h>
@@ -10,4 +11,5 @@ void bootblock_soc_init(void)
 	mtk_mmu_init();
 	mtk_wdt_init();
 	mt_pll_init();
+	unmask_eint_event_mask();
 }