src/include: Add space around operators

Change-Id: I0ee4c443b6861018f05cfc32135d632fd4996029
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/16614
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/include/pc80/mc146818rtc.h b/src/include/pc80/mc146818rtc.h
index a77c1c5..effc03d 100644
--- a/src/include/pc80/mc146818rtc.h
+++ b/src/include/pc80/mc146818rtc.h
@@ -40,7 +40,7 @@
    /* 2 values for divider stage reset, others for "testing purposes only" */
 #  define RTC_DIV_RESET1	0x60
 #  define RTC_DIV_RESET2	0x70
-  /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */
+  /* Periodic intr. / Square wave rate select. 0 = none, 1 = 32.8kHz,... 15 = 2Hz */
 # define RTC_RATE_SELECT 	0x0F
 #  define RTC_RATE_NONE		0x00
 #  define RTC_RATE_32786HZ	0x01