skylake: ajdust cache-as-ram region to 64KiB

FSP is actually providing 64KiB to the bootloader.
Expand current footprint to match reality.

BUG=chrome-os-partner:44676
BRANCH=None
TEST=Built and booted glados.

Original-Change-Id: Ibff243036eb4a6b9b9f331665a7e3efa1853bc91
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/300191
Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-by: Leroy P Leahy <leroy.p.leahy@intel.com>

Change-Id: Ibb876f49c3e5d8d1a3b8f6f74ed12a19663e4145
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11810
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/src/soc/intel/skylake/Kconfig b/src/soc/intel/skylake/Kconfig
index bf747d4..1f42927 100644
--- a/src/soc/intel/skylake/Kconfig
+++ b/src/soc/intel/skylake/Kconfig
@@ -81,7 +81,7 @@
 
 config DCACHE_RAM_SIZE
 	hex "Length in bytes of cache-as-RAM"
-	default 0x4000
+	default 0x10000
 	help
 	  The size of the cache-as-ram region required during bootblock
 	  and/or romstage.