CBMEM: Always select CAR_MIGRATION

If romstage does not make cbmem_initialize() call, linker should
optimize the code for CAR migration away.

This simplifies design of CBMEM console by a considerable amount.
As console buffer is now migrated within cbmem_initialize() call there
is no longer need for cbmemc_reinit() call made at end of romstage.

Change-Id: I8675ecaafb641fa02675e9ba3f374caa8e240f1d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3916
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/cpu/intel/haswell/Kconfig

@@ -18,7 +18,6 @@ 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

@@ -278,7 +278,6 @@ void romstage_common(const struct romstage_params *params)
 #if CONFIG_CHROMEOS
 	init_chromeos(boot_mode);
 #endif
-	timestamp_sync();
 	timestamp_add_now(TS_END_ROMSTAGE);
 }