ACPI: Add helper fill_fadt_extended_pm_io()

Once platform code has filled in the (legacy) ACPI PM register
map, added function will fill in the extended entries in FADT.

TEST=samsung/lumpy and amd/mandolin FADT stays unchanged.

Change-Id: I90925fce35458cf5480bfefc7cdddebd41b42058
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74913
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
diff --git a/src/soc/intel/xeon_sp/skx/soc_acpi.c b/src/soc/intel/xeon_sp/skx/soc_acpi.c
index eedf387..35e3ea1 100644
--- a/src/soc/intel/xeon_sp/skx/soc_acpi.c
+++ b/src/soc/intel/xeon_sp/skx/soc_acpi.c
@@ -50,22 +50,8 @@
 
 	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042;
 
-	/* PM2 Control Registers */
-	fadt->x_pm2_cnt_blk.space_id = ACPI_ADDRESS_SPACE_IO;
-	fadt->x_pm2_cnt_blk.bit_width = fadt->pm2_cnt_len * 8;
-	fadt->x_pm2_cnt_blk.bit_offset = 0;
-	fadt->x_pm2_cnt_blk.access_size = ACPI_ACCESS_SIZE_BYTE_ACCESS;
-	fadt->x_pm2_cnt_blk.addrl = fadt->pm2_cnt_blk;
-	fadt->x_pm2_cnt_blk.addrh = 0x0;
-
-	/* PM1 Timer Register */
-	fadt->x_pm_tmr_blk.space_id = ACPI_ADDRESS_SPACE_IO;
-	fadt->x_pm_tmr_blk.bit_width = fadt->pm_tmr_len * 8;
-	fadt->x_pm_tmr_blk.bit_offset = 0;
-	fadt->x_pm_tmr_blk.access_size = ACPI_ACCESS_SIZE_DWORD_ACCESS;
-	fadt->x_pm_tmr_blk.addrl = fadt->pm_tmr_blk;
-	fadt->x_pm_tmr_blk.addrh = 0x0;
-
+	/* PM Extended Registers */
+	fill_fadt_extended_pm_io(fadt);
 }
 
 void uncore_inject_dsdt(const struct device *device)