intel: Turn `DEFAULT_RCBA` into a Kconfig symbol

Create `FIXED_RCBA_MMIO_BASE` and use it everywhere, except in cases
where a pointer cast would be necessary. Instances in Sandy Bridge MRC
code were left as-is intentionally, so as not to collide with another
cleanup patch train.

Tested with BUILD_TIMELESS=1, these boards remain identical:
- Asus P8Z77-V LX2
- Packard Bell MS2290

Change-Id: I642958fbd6f02dbf54812d6a75d6bc3087acc77a
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50036
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/gm45/acpi/gm45.asl b/src/northbridge/intel/gm45/acpi/gm45.asl
index 7f64219..8c5fb49 100644
--- a/src/northbridge/intel/gm45/acpi/gm45.asl
+++ b/src/northbridge/intel/gm45/acpi/gm45.asl
@@ -3,7 +3,6 @@
 #include "hostbridge.asl"
 #include "../memmap.h"
 #include <southbridge/intel/i82801ix/i82801ix.h>
-#include <southbridge/intel/common/rcba.h>
 
 /* PCI Device Resource Consumption */
 Device (PDRC)
@@ -14,7 +13,7 @@
 	// This does not seem to work correctly yet - set values statically for
 	// now.
 	Name (PDRS, ResourceTemplate() {
-		Memory32Fixed(ReadWrite, DEFAULT_RCBA, 0x00004000)
+		Memory32Fixed(ReadWrite, CONFIG_FIXED_RCBA_MMIO_BASE, 0x00004000)
 		Memory32Fixed(ReadWrite, DEFAULT_MCHBAR,   0x00004000)
 		Memory32Fixed(ReadWrite, DEFAULT_DMIBAR,   0x00001000)
 		Memory32Fixed(ReadWrite, DEFAULT_EPBAR,    0x00001000)