Addw2 support (#67)

* Add addw2 board

* Set charge params and update gpio.h

* Set VGA fan to 100% when entering scratch rom

* Implement keyboard LEDs

* Turn off keyboard LEDs in gpio defaults

* Default airplane mode LED to off

* Enable GPU power and fan control

* Add NVIDIA GPU power and temp to power.csv

* Add NVIDIA GPU fan value to power.sh

* Move GPU init back to coreboot

* Do not turn on GPU fan if GPU is off

* Show POST codes

* Add timestamps to console_external

* Accept port 81 cycles

* Move setting RSTS into ec_init

* Move post code debugging to system76/common

* Move some GPIO init from system76/common to boards

* Make some power signals optional

* Remove POST code support - it only works on IT5570

src/ec/it5570e/ec.c

@@ -0,0 +1,6 @@
+#include <ec/ec.h>
+#include <ec/gctrl.h>
+
+void ec_init(void) {
+    RSTS = 0x44;
+}

src/ec/it5570e/include/ec/ec.h

@@ -0,0 +1,6 @@
+#ifndef _EC_EC_H
+#define _EC_EC_H
+
+void ec_init(void);
+
+#endif // _EC_EC_H

src/ec/it5570e/include/ec/gctrl.h

@@ -6,5 +6,8 @@
 volatile uint8_t __xdata __at(0x2006) RSTS;
 volatile uint8_t __xdata __at(0x200A) BADRSEL;
 volatile uint8_t __xdata __at(0x200D) SPCTRL1;
+volatile uint8_t __xdata __at(0x2030) P80H81HS;
+volatile uint8_t __xdata __at(0x2031) P80HD;
+volatile uint8_t __xdata __at(0x2032) P81HD;
 
 #endif // _EC_GCTRL_H

src/ec/it8587e/ec.c

@@ -0,0 +1,6 @@
+#include <ec/ec.h>
+#include <ec/gctrl.h>
+
+void ec_init(void) {
+    RSTS = 0x84;
+}

src/ec/it8587e/include/ec/ec.h

@@ -0,0 +1,6 @@
+#ifndef _EC_EC_H
+#define _EC_EC_H
+
+void ec_init(void);
+
+#endif // _EC_EC_H