Add keyboard controller reset command.

To handle outp(0x64, 0xfe) instruction from host.

BUG=chrome-os-partner:8464,chrome-os-partner:8397
TEST= build on bds and l*. tested on proto 0.5.

Change-Id: I8cb3a870b2a5c7a711dc911ba44e154813e9f123

common/keyboard.c

@@ -14,6 +14,7 @@
 #include "timer.h"
 #include "uart.h"
 #include "util.h"
+#include "x86_power.h"
 
 
 #define KEYBOARD_DEBUG 1
@@ -499,6 +500,12 @@ int handle_keyboard_command(uint8_t command, uint8_t *output) {
     data_port_state = STATE_SEND_TO_MOUSE;
     break;
 
+#ifdef CONFIG_TASK_X86POWER
+  case I8042_SYSTEM_RESET:
+    x86_power_reset();
+    break;
+#endif
+
   default:
     if (command >= I8042_READ_CTL_RAM &&
         command <= I8042_READ_CTL_RAM_END) {