ACPI: PRM: Find PRMT table before parsing it

mainline inclusion
from mainline-v5.15
commit 3265cc3e
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I6HNB8


CVE: N/A

Intel-SIG: commit 3265cc3e ACPI: PRM: Find PRMT table before
parsing it.
ACPI Platform Runtime Mechanism feature backport.

--------------------------------

Find and verify PRMT before parsing it, which eliminates a
warning on machines without PRMT:

	[    7.197173] ACPI: PRMT not present

Fixes: cefc7ca4 ("ACPI: PRM: implement OperationRegion handler for the PlatformRtMechanism subtype")
Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>
Tested-by: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: 5.14+ <stable@vger.kernel.org> # 5.14+
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>