soc/amd/common/acpimmio: factor out IO port access to PM registers

Factor out all functions that use the indirect IO port based access to
the PM registers into a new compilation unit and only select it on
platforms that support this interface.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: If9c059e450e2137f7e05441ab89c1f0e7077be9a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76458
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>

src/soc/amd/stoneyridge/Kconfig

@@ -24,6 +24,7 @@ config SOC_AMD_STONEYRIDGE
 	select SOC_AMD_COMMON_BLOCK_ACPI_CPU_POWER_STATE
 	select SOC_AMD_COMMON_BLOCK_ACPIMMIO
 	select SOC_AMD_COMMON_BLOCK_ACPIMMIO_BIOSRAM
+	select SOC_AMD_COMMON_BLOCK_ACPIMMIO_PM_IO_ACCESS
 	select SOC_AMD_COMMON_BLOCK_AOAC
 	select SOC_AMD_COMMON_BLOCK_BANKED_GPIOS
 	select SOC_AMD_COMMON_BLOCK_CAR