ACPI fixes for 5.9-rc3

 - Avoid redundant rounding to the page size in acpi_os_map_iomem()
   to address a recently introduced issue with the EFI memory map
   permission check on ARM64 (Ard Biesheuvel).

 - Fix acpi_release_memory() to wait until the memory mappings
   released by it have been really unmapped (Rafael Wysocki).

 - Make the ACPI driver for AMD SoCs (APD) check the return value
   of acpi_dev_get_property() to avoid failures in the cases when the
   device property under inspection is missing (Furquan Shaikh).
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