init: Move gettime() to util.c

Change-Id: I1df96964763f8baedbc1cea6875d3dfc5e48c065
diff --git a/init/init.h b/init/init.h
index 2d18b9e..8210238 100644
--- a/init/init.h
+++ b/init/init.h
@@ -25,6 +25,7 @@
                   uid_t uid, gid_t gid);
 
 void *read_file(const char *fn, unsigned *_sz);
+time_t gettime(void);
 
 void log_init(void);
 void log_set_level(int level);