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/reg_script.h

@@ -107,7 +107,7 @@ struct reg_script_bus_entry {
 	void (*reg_script_write)(struct reg_script_context *ctx);
 };
 
-#define REG_SCRIPT_TABLE_ATTRIBUTE __attribute__ ((used,section (".rsbe_init")))
+#define REG_SCRIPT_TABLE_ATTRIBUTE __attribute__ ((used, section (".rsbe_init")))
 
 #define REG_SCRIPT_BUS_ENTRY(bus_entry_)				\
 	const struct reg_script_bus_entry *rsbe_ ## bus_entry_ 	\