More ACPI updates for v4.9-rc1

 - Fix an unused function warning that started to appear after recent
   changes in the ACPI EC driver (Eric Biggers).

 - Fix the KERN_CONT usage in acpi_os_vprintf() that has become
   (particularly) annoying recently (Joe Perches).

 - Fix the fan status checking in the ACPI fan driver to avoid
   returning incorrect error codes sometimes (Srinivas Pandruvada).

 - Fix the ACPI Processor Aggregator driver (PAD) to always let the
   special processor_aggregator driver from Xen take over when
   running as Xen dom0 (Juergen Gross).

 - Update the handling of reference device properties in ACPI by
   allowing empty rows ("holes") to appear in reference property
   lists (Mika Westerberg).

 - Add a new MAINTAINERS entry for ACPI on ARM64 (Lorenzo Pieralisi).
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