Fix Sandybridge/Ivybridge mainboards according to code review

This fixes a few cosmetics with the following three boards:

 - Intel Emerald Lake 2
 - Samsung ChromeBook
 - Samsung ChromeBox

The following issues were fixed:

 - rely on include path in ASL code instead of specifying relative
   paths
 - use updated ALIGN_CURRENT in acpi_tables.c
 - use preprocessor defines instead of hard coded values where possible

Change-Id: Ia5941be3873aa84c30c13ff2f0428d1c52daa563
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/963
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Tested-by: build bot (Jenkins)
diff --git a/src/northbridge/intel/sandybridge/sandybridge.h b/src/northbridge/intel/sandybridge/sandybridge.h
index 9ff6555..c7bea98 100644
--- a/src/northbridge/intel/sandybridge/sandybridge.h
+++ b/src/northbridge/intel/sandybridge/sandybridge.h
@@ -51,6 +51,7 @@
 #define DEFAULT_MCHBAR		0xfed10000	/* 16 KB */
 #define DEFAULT_DMIBAR		0xfed18000	/* 4 KB */
 #define DEFAULT_EPBAR		0xfed19000	/* 4 KB */
+#define DEFAULT_RCBABASE	0xfed1c000
 
 #include "../../../southbridge/intel/bd82x6x/pch.h"