update file paths for Android

On Android, the executables are stored under /system/bin and the
data files (e.g. config file) will be stored under
/data/misc/apmanager/.  So conditionally use those paths for
Android.

Bug: 22828115
TEST=Manual test on dragonboard
TEST=Run unittest for Chrome OS

Change-Id: I7db70c93cb1b8c206742a788e356dcc195160f43
diff --git a/hostapd_monitor.cc b/hostapd_monitor.cc
index 997ec54..29785cb 100644
--- a/hostapd_monitor.cc
+++ b/hostapd_monitor.cc
@@ -34,8 +34,14 @@
 namespace apmanager {
 
 // static.
+#if !defined(__ANDROID__)
 const char HostapdMonitor::kLocalPathFormat[] =
     "/var/run/apmanager/hostapd/hostapd_ctrl_%s";
+#else
+const char HostapdMonitor::kLocalPathFormat[] =
+    "/data/misc/apmanager/hostapd/hostapd_ctrl_%s";
+#endif  // __ANDROID__
+
 const char HostapdMonitor::kHostapdCmdAttach[] = "ATTACH";
 const char HostapdMonitor::kHostapdRespOk[] = "OK\n";
 const char HostapdMonitor::kHostapdEventStationConnected[] = "AP-STA-CONNECTED";