mediatek/mt8173: Add mt6391 PMIC driver

BUG=none
TEST=emerge-oak coreboot
BRANCH=none

Change-Id: I2b9e1fc16183a29ba308313d347f2f0e948e96a7
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: ee56cab3b5c04838af80690c21d3aa160d71501a
Original-Change-Id: I2eaa0a406c29b7c9012e3c9860967fc3f27a48a5
Original-Signed-off-by: henryc.chen <henryc.chen@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/292669
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/12608
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/google/oak/bootblock.c

@@ -18,9 +18,11 @@
  */
 
 #include <arch/io.h>
+#include <boardid.h>
 #include <bootblock_common.h>
 #include <delay.h>
 #include <soc/gpio.h>
+#include <soc/mt6391.h>
 #include <soc/pericfg.h>
 #include <soc/pinmux.h>
 
@@ -49,4 +51,7 @@ void bootblock_mainboard_init(void)
 	i2c_set_gpio_pinmux();
 
 	setup_chromeos_gpios();
+
+	if (board_id() < 4)
+		mt6391_enable_reset_when_ap_resets();
 }