ROMCC boards: Fix builds with CBMEM console, timestamps or usbdebug

These features depend on CAR_GLOBAL region, which is not available
when romstage is built with ROMCC. Exclude these from romstage, keep
them available for ramstage.

A follow-up patch will fix the dependencies and allows enabling these
features in menuconfig.

Change-Id: I9de5ad41ea733655a3fbdc734646f818e39cc471
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3919
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/include/console/cbmem_console.h

@@ -19,8 +19,14 @@
 #ifndef _CONSOLE_CBMEM_CONSOLE_H_
 #define _CONSOLE_CBMEM_CONSOLE_H_
 
+#if CONFIG_CACHE_AS_RAM || !defined(__PRE_RAM__)
 void cbmemc_init(void);
 void cbmemc_reinit(void);
 void cbmemc_tx_byte(unsigned char data);
+#else
+#define cbmemc_init()
+#define cbmemc_reinit()
+#define cbmemc_tx_byte()
+#endif
 
 #endif