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)

src/mainboard/samsung/lumpy/acpi_tables.c

@@ -177,7 +177,7 @@ unsigned long acpi_fill_srat(unsigned long current)
 
 void smm_setup_structures(void *gnvs, void *tcg, void *smi1);
 
-#define ALIGN_CURRENT current = ((current + 0x0f) & -0x10)
+#define ALIGN_CURRENT current = (ALIGN(current, 16))
 unsigned long write_acpi_tables(unsigned long start)
 {
 	unsigned long current;