ACPICA: Enable ACPICA prototypes for CONFIG_ACPI=n builds.

v3:
PATCH 3/7 updated to remove new Kconfig item.

This is the last series for ACPICA header inclusion cleanups. The whole story can be found below:
1. Unsafe inclusions:

     origin: https://lkml.org/lkml/2013/11/22/510
     merged: https://lkml.org/lkml/2013/12/6/79
  2. Header orders:
     origin: https://lkml.org/lkml/2014/4/8/57
     merged: https://lkml.org/lkml/2014/5/12/111
  3. Header stubs:
     origin: https://lkml.org/lkml/2014/12/18/149
     merged: https://lkml.org/lkml/2014/4/29/716

This patchset contains patches that are parts of the last series sent before, so it is marked as v2 belonging to the same thread as this series:
https://lkml.org/lkml/2014/12/18/149

Now we have cleaned up all mis-ordered ACPICA headers and implemented stubs for ACPICA prototypes (functions, global variables, macros), we finally can enable ACPICA headers for CONFIG_ACPI=n builds so that all ACPICA defined types are visible to all kernel source files.

After exposing ACPICA types to all kernel sources, we can also sort the final wrong <acpi/acpi.h> inclusion out of <linux/sfi_acpi.h>.

This patchset also includes a rule enforcement patch to avoid future inclusion mistakes.

The patch set has passed a build/boot test on the following machines:
Dell Inspiron Mini 1010 (i386)
HP Compaq 8200 Elite SFF PC (x86-64)
With the following kernel configuration items enabled:
All drivers/acpi configurations
All platform drivers
All ACPI drivers
4 DRM drivers that implement ACPI opregion
All buses with ACPI bindings
All cpufreq configurations
All xen configurations
All ACPI table drivers
They are tested twice with CONFIG_ACPI enabled/disabled.

Also allyes/allno/allmod tests are done for ARCH=i386 and ARCH=x86_64.

A boot test has been done to ARCH=x86_64 default configuration and it is confirmed that the ACPI devices are successfully created under /sys/bus/acpi/devices when CONFIG_ACPI is enabled.

Lv Zheng (7):
ACPICA: Linux: Add stub support for Linux specific variables and
functions.
ACPICA: Linux: Add stub implementation of ACPICA 64-bit mathematics.
ACPICA: Linux: Add support to exclude <asm/acenv.h> inclusion.
ACPICA: Linux: Allow ACPICA inclusion for CONFIG_ACPI=n builds. ACPI/SFI: Fix wrong <acpi/acpi.h> inclusion in SFI/ACPI wrapper -
table definitions.
ACPI: Add support to force header inclusion rules for <acpi/acpi.h>.
ACPI: Cleanup useless ACPI inclusion.

 arch/ia64/include/asm/acenv.h     |    4 ----
 arch/x86/include/asm/acenv.h      |    4 ----
 drivers/acpi/acpica/Makefile      |    2 +-
 drivers/acpi/bus.c                |    3 ---
 include/acpi/acpixf.h             |   28 +++++++++++++++++-----------
 include/acpi/platform/aclinux.h   |   12 ++++++++++++
 include/acpi/platform/aclinuxex.h |   22 ++++++++++++++++++++++
 include/linux/acpi.h              |    6 +++---
 include/linux/sfi_acpi.h          |    3 ---
 sound/soc/intel/sst-haswell-dsp.c |    3 ---
 10 files changed, 55 insertions(+), 32 deletions(-)

1.7.10