Drop prototype guarding for romcc

Commit "romcc: Don't fail on function prototypes" (11a7db3b) [1]
made romcc not choke on function prototypes anymore. This
allows us to get rid of a lot of ifdefs guarding __ROMCC__ .

[1] http://review.coreboot.org/2424

Change-Id: Ib1be3b294e5b49f5101f2e02ee1473809109c8ac
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/3216
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/include/cpu/intel/speedstep.h

@@ -105,9 +105,7 @@ typedef struct {
 	int num_states;
 } sst_table_t;
 
-#ifndef __ROMCC__
 void speedstep_gen_pstates(sst_table_t *);
-#endif
 
 #define SPEEDSTEP_MAX_POWER_YONAH	31000
 #define SPEEDSTEP_MIN_POWER_YONAH	13100