baytrail: allow ramstage_cache_location() usage in ramstage

To prepare for caching reference code for S3 resume the
ramstage cache needs to be accesible in ramstage as well.

BUG=chrome-os-partner:22867
BRANCH=None
TEST=Built and booted. S3 resumed.

Change-Id: I4c825c965b98cd71ea0eb9c93fe168a358da4c97
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/179776
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/5012
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/soc/intel/baytrail/Makefile.inc

@@ -45,6 +45,8 @@ ramstage-y += lpss.c
 ramstage-y += pcie.c
 ramstage-y += sd.c
 ramstage-y += perf_power.c
+ramstage-y += stage_cache.c
+romstage-y += stage_cache.c
 
 # Remove as ramstage gets fleshed out
 ramstage-y += placeholders.c