src/cpu: Add required space before opening parenthesis '('

Change-Id: I7fb9bfcaeec0b9dfd0695d2b2d398fd01091f6bc
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/16286
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Omar Pakker

src/cpu/x86/tsc/delay_tsc.c

@@ -116,7 +116,7 @@ void udelay(unsigned us)
 	clocks = us;
 	clocks *= get_clocks_per_usec();
 	current = rdtscll();
-	while((current - start) < clocks) {
+	while ((current - start) < clocks) {
 		cpu_relax();
 		current = rdtscll();
 	}