sb/intel/{bd82x6,ibexpeak}: Move RCBA macros to a common location

Many generations of Intel hardware have identical code concerning the
RCBA.

Change-Id: I33ec6801b115c0d64de1d2a0dc5d439186f3580a
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/23287
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
diff --git a/src/northbridge/intel/sandybridge/sandybridge.h b/src/northbridge/intel/sandybridge/sandybridge.h
index 8bbfae9..a3b4faa 100644
--- a/src/northbridge/intel/sandybridge/sandybridge.h
+++ b/src/northbridge/intel/sandybridge/sandybridge.h
@@ -58,6 +58,7 @@
 #define IOMMU_BASE2		0xfed91000ULL
 
 #include <southbridge/intel/bd82x6x/pch.h>
+#include <southbridge/intel/common/rcba.h>
 
 /* Everything below this line is ignored in the DSDT */
 #ifndef __ACPI__