intel car: Remove references to DCACHE_RAM_ROMSTACK_SIZE

Not referenced in code.

Change-Id: Iea91f4418eb122fb647ec0f4f42cb786e8eadf23
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17268
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/soc/intel/braswell/Kconfig b/src/soc/intel/braswell/Kconfig
index b587988..ddd7051 100644
--- a/src/soc/intel/braswell/Kconfig
+++ b/src/soc/intel/braswell/Kconfig
@@ -75,9 +75,9 @@
 # Cache As RAM region layout:
 #
 # +-------------+ DCACHE_RAM_BASE + DCACHE_RAM_SIZE
-# |  Stack      |\
-# |    |        | * DCACHE_RAM_ROMSTAGE_STACK_SIZE
-# |    v        |/
+# |  Stack      |
+# |    |        |
+# |    v        |
 # +-------------+
 # |    ^        |
 # |    |        |
@@ -97,13 +97,6 @@
 	  and/or romstage. Note DCACHE_RAM_SIZE and DCACHE_RAM_MRC_VAR_SIZE
 	  must add up to a power of 2.
 
-config DCACHE_RAM_ROMSTAGE_STACK_SIZE
-	hex
-	default 0x800
-	help
-	  The amount of anticipated stack usage from the data cache
-	  during pre-ram ROM stage execution.
-
 config RESET_ON_INVALID_RAMSTAGE_CACHE
 	bool "Reset the system on S3 wake when ramstage cache invalid."
 	default n