src/include: Add space after comma

Fix the following error detected by checkpatch.pl:

ERROR: space required after that ',' (ctx:VxV)

TEST=Build and run on Galileo Gen2

Change-Id: I297bfc3d03dc95b471d3bb4b13803e81963841b5
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18647
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/include/bootstate.h

@@ -183,7 +183,7 @@ struct boot_state_init_entry {
 };
 
 #if ENV_RAMSTAGE
-#define BOOT_STATE_INIT_ATTR  __attribute__ ((used,section (".bs_init")))
+#define BOOT_STATE_INIT_ATTR  __attribute__ ((used, section (".bs_init")))
 #else
 #define BOOT_STATE_INIT_ATTR  __attribute__ ((unused))
 #endif