haswell: enable cache-as-ram migration

The haswell code allows for vboot ramstage verification.
However, that code path relies on accessing global cache-as-ram
variables after cache-as-ram is torn down. In order to avoid
that situation enable cache-as-ram migration.

cbmemc_reinit() no longer needs to be called from romstage
because it is invoked automatically by the cache-as-ram
migration infrastructure.

Change-Id: I08998dca579c167699030e1e24ea0af8802c0758
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/3236
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/cpu/intel/haswell/Kconfig

@@ -18,6 +18,7 @@ config CPU_SPECIFIC_OPTIONS
 	#select AP_IN_SIPI_WAIT
 	select TSC_SYNC_MFENCE
 	select CPU_INTEL_FIRMWARE_INTERFACE_TABLE
+	select CAR_MIGRATION
 
 config BOOTBLOCK_CPU_INIT
 	string

src/cpu/intel/haswell/romstage.c

@@ -188,11 +188,6 @@ void * asmlinkage romstage_main(unsigned long bist)
 	/* Get the stack to use after cache-as-ram is torn down. */
 	romstage_stack_after_car = setup_romstage_stack_after_car();
 
-#if CONFIG_CONSOLE_CBMEM
-	/* Keep this the last thing this function does. */
-	cbmemc_reinit();
-#endif
-
 	return romstage_stack_after_car;
 }