Additional ACPI updates for 5.7-rc1

 - Update the ACPICA code in the kernel to upstream revision 20200326
   including:

   * Fix for a typo in a comment field (Bob Moore).
   * acpiExec namespace init file fixes (Bob Moore).
   * Addition of NHLT to the known tables list (Cezary Rojewski).
   * Conversion of PlatformCommChannel ASL keyword to PCC (Erik
     Kaneda).
   * acpiexec cleanup (Erik Kaneda).
   * WSMT-related typo fix (Erik Kaneda).
   * sprintf() utility function fix (John Levon).
   * IVRS IVHD type 11h parsing implementation (Michał Żygowski).
   * IVRS IVHD type 10h reserved field name fix (Michał Żygowski).

 - Fix ACPI-related CPU hotplug deadlock on x86 (Qian Cai).

 - Fix Intel Tiger Lake ACPI device IDs in several places (Gayatri
   Kammela).

 - Add ACPI backlight blacklist entry for Acer Aspire 5783z (Hans
   de Goede).

 - Fix documentation of the "acpi_backlight" kernel command line
   switch (Randy Dunlap).

 - Clean up the acpi_get_psd_map() CPPC library routine (Liguang
   Zhang).
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