soc/mediatek/mt8188: Enable and initialize EINT

Issue:
Device can't wake up using power key.

Root cause and solution:
EINT event mask register is used to mask EINT wakeup sources. All
wakeup sources are masked by default. So we add a driver here to unmask
all wakeup sources.

BUG=none
TEST=wake the device up by power key on MT8188 EVB.

Signed-off-by: Johnson Wang <johnson.wang@mediatek.com>
Change-Id: I94b20909b0b8d77f75c41bc745f892baded7a54b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69688
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/soc/mediatek/mt8188/Makefile.inc

@@ -10,6 +10,7 @@ all-y += ../common/timer.c ../common/timer_prepare.c
 all-y += ../common/uart.c
 
 bootblock-y += bootblock.c
+bootblock-y += ../common/eint_event.c
 bootblock-y += ../common/mmu_operations.c
 bootblock-y += ../common/tracker.c ../common/tracker_v2.c
 bootblock-y += ../common/wdt.c ../common/wdt_req.c wdt.c

src/soc/mediatek/mt8188/bootblock.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
 
 #include <bootblock_common.h>
+#include <soc/eint_event.h>
 #include <soc/mmu_operations.h>
 #include <soc/pll.h>
 #include <soc/tracker_common.h>
@@ -12,4 +13,5 @@ void bootblock_soc_init(void)
 	bustracker_init();
 	mtk_wdt_init();
 	mt_pll_init();
+	unmask_eint_event_mask();
 }