ACPI updates for v4.15-rc1

 - Update the ACPICA code to upstream revision 20170831 including
   * PDTT table header support (Bob Moore).
   * Cleanup and extension of internal string-to-integer conversion
     functions (Bob Moore).
   * Support for 64-bit hardware accesses (Lv Zheng).
   * ACPI PM Timer code adjustment to deal with 64-bit return values
     of acpi_hw_read() (Bob Moore).
   * Support for deferred table verification in acpiexec (Lv Zheng).

 - Fix APEI to use the fixmap instead of ioremap_page_range() which
   cannot work correctly the way the code in there attempted to use
   it and drop some code that's not necessary any more after that
   change (James Morse).

 - Clean up the APEI support code and make it use 64-bit timestamps
   (Arnd Bergmann, Dongjiu Geng, Jan Beulich).

 - Add operation region driver for TI PMIC TPS68470 (Rajmohan Mani).

 - Add support for PCC subspace IDs to the ACPI CPPC driver (George
   Cherian).

 - Fix an ACPI EC driver regression related to the handling of EC
   events during the "noirq" phases of system suspend/resume (Lv
   Zheng).

 - Delay the initialization of the lid state in the ACPI button
   driver to fix issues appearing on some systems (Hans de Goede).

 - Extend the KIOX000A "device always present" quirk to cover all
   affected BIOS versions (Hans de Goede).

 - Clean up some code in the ACPI core and drivers (Colin Ian King,
   Gustavo Silva).
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