ACPI: Use common OperationRegion for PCI_MMCONF

Change-Id: Iadb4c3c77ecda4df8e48415d246e769ede2ce86d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50648
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/southbridge/amd/cimx/sb800/acpi/pcie.asl b/src/southbridge/amd/cimx/sb800/acpi/pcie.asl
index 65ac920..f69ba1d 100644
--- a/src/southbridge/amd/cimx/sb800/acpi/pcie.asl
+++ b/src/southbridge/amd/cimx/sb800/acpi/pcie.asl
@@ -29,9 +29,7 @@
 }
 
 Scope(\_SB) {
-	/* PCIe Configuration Space for 16 busses */
-	OperationRegion(PCFG, SystemMemory, PCBA, 0x01000000) /* Each bus consumes 1MB */
-		Field(PCFG, ByteAcc, NoLock, Preserve) {
+	Field(PCFG, ByteAcc, NoLock, Preserve) {
 		/* Byte offsets are computed using the following technique:
 		 * ((bus number + 1) * ((device number * 8) * 4096)) + register offset
 		 * The 8 comes from 8 functions per device, and 4096 bytes per function config space