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/lib/timestamp.c

@@ -140,7 +140,7 @@ void timestamp_init(tsc_t base)
 #endif
 }
 
-void timestamp_sync(void)
+void timestamp_reinit(void)
 {
 	if (!boot_cpu())
 		return;
@@ -154,3 +154,6 @@ void timestamp_sync(void)
 	if (ts_table)
 		timestamp_do_sync();
 }
+
+/* Call timestamp_reinit at CAR migration time. */
+CAR_MIGRATE(timestamp_reinit)