ACPICA commit 1209ecf682e03d9ef0c22f4986a2e53b03bd2985

The Dword_pcc (alongside word_pcc and Qword_pcc) were accepted to ACPI
inclusion via a code-first process.

This patch implements support in iASL for Dword_pcc.

Link: https://bugzilla.tianocore.org/show_bug.cgi?id=4594
Link: https://github.com/acpica/acpica/commit/1209ecf6Signed-off-by: Jose Marinho <jose.marinho@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>