x86: Add mrccache support for a 'variable' cache

Add support for a second cache type, for Apollo Lake.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/include/asm/mrccache.h

@@ -30,6 +30,7 @@ struct mrc_region {
 /* Types of MRC data */
 enum mrc_type_t {
 	MRC_TYPE_NORMAL,
+	MRC_TYPE_VAR,
 
 	MRC_TYPE_COUNT,
 };