siemens/mc_apl1: Extend circuit life by clock gating and power gating

The firmware of devices connected to LPC should deassert the LPC CLKRUN#
signal when there is no bus activity on LPC.

Necessary changes:

- Enable LPC CLKRUN#
- Enable LPC PCE (Power Control Enable)
- Enable LPC CCE (Clock Control Enable)
- Remove I/O decoding range on LPC for COM 3
- Disable I/O UART driver

Change-Id: I2fd80e3fdcf23658f97b8182a77df7e09ddf25d6
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/28268
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/soc/intel/apollolake/include/soc/pcr_ids.h

@@ -2,6 +2,7 @@
  * This file is part of the coreboot project.
  *
  * Copyright 2017 Intel Corporation.
+ * Copyright (C) 2018 Siemens AG
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -31,6 +32,7 @@
 #define PID_GPIO_N	0xC5
 #define PID_ITSS	0xD0
 #define PID_RTC		0xD1
+#define PID_LPC		0xD2
 
 #define PID_AUNIT	0x4d
 #define PID_BUNIT	0x4c