sdm660-common: gps: Don't rely on transitively included headers

One must explicitly include what it need.
time.h for struct tm.
sys/time.h for gettimeofday, etc.

Bug: 37629934
Test: build

Merged-In: Iacd5317d958f61df062fca40fbf2e8992c7fbb44
Change-Id: I19e1043f23dbe85836b73714a4f1440159ebe419

gps/gnss/XtraSystemStatusObserver.cpp

@@ -32,6 +32,7 @@
 #include <sys/un.h>
 #include <errno.h>
 #include <ctype.h>
+#include <unistd.h>
 #include <cutils/properties.h>
 #include <math.h>
 #include <arpa/inet.h>

gps/utils/loc_log.cpp

@@ -33,6 +33,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/time.h>
+#include <time.h>
 #include "log_util.h"
 #include "loc_log.h"
 #include "msg_q.h"