sandybridge: Allow skipping mrc.cache

On X230 MRC fails if cache is passed to it. Until better solution is found
do not create mrc.cache

Change-Id: I7e70ebe3c4879e7ab33a9c95a0c9e40408ff5ca4
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4680
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/northbridge/intel/sandybridge/Kconfig b/src/northbridge/intel/sandybridge/Kconfig
index 5b6285f..83da527 100644
--- a/src/northbridge/intel/sandybridge/Kconfig
+++ b/src/northbridge/intel/sandybridge/Kconfig
@@ -70,6 +70,10 @@
 
 	  Note: Without this binary coreboot will not work
 
+config HAVE_MRC_CACHE
+       bool
+       default HAVE_MRC
+
 config MRC_FILE
 	string "Intel System Agent path and filename"
 	depends on HAVE_MRC