src/include: Wrap lines at 80 columns

Fix the following warning detected by checkpatch.pl:

WARNING: line over 80 characters

Changed a few comments to reduce line length.  File
src/include/cpu/amd/vr.h was skipped.

TEST=Build and run on Galileo Gen2

Change-Id: Ie3c07111acc1f89923fb31135684a6d28a505b61
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18687
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/include/timestamp.h

@@ -18,7 +18,8 @@
 
 #include <commonlib/timestamp_serialized.h>
 
-#if CONFIG_COLLECT_TIMESTAMPS && (CONFIG_EARLY_CBMEM_INIT || !defined(__PRE_RAM__))
+#if CONFIG_COLLECT_TIMESTAMPS && (CONFIG_EARLY_CBMEM_INIT \
+	|| !defined(__PRE_RAM__))
 /*
  * timestamp_init() needs to be called once for each of these cases:
  *    1. __PRE_RAM__ (bootblock, romstage, verstage, etc) and