actually print log times fixed-width

Change-Id: I26fbfbdd321b74fa38957a4da5e7c6177df35c92
diff --git a/aos/common/logging/logging_printf_formats.h b/aos/common/logging/logging_printf_formats.h
index be186bc..0bf253c 100644
--- a/aos/common/logging/logging_printf_formats.h
+++ b/aos/common/logging/logging_printf_formats.h
@@ -24,7 +24,7 @@
 
 // These 2 define how many digits we use to print out the nseconds fields of
 // times. They have to stay matching.
-#define AOS_TIME_NSECONDS_DIGITS 5
+#define AOS_TIME_NSECONDS_DIGITS 6
 #define AOS_TIME_NSECONDS_DENOMINATOR 10000
 
 #endif  // AOS_COMMON_LOGGING_LOGGING_PRINTF_FORMATS_H_