adb: Only use properties on device builds

When building for the host, don't make reference to
property_get / property_set.  I'm in the process of removing
host side support for properties.

Change-Id: I691c5872b5fd538e78bc38a3fe72574cdc7f43c3
diff --git a/services.c b/services.c
index d2d428a..f0d5878 100644
--- a/services.c
+++ b/services.c
@@ -35,6 +35,7 @@
 #  endif
 #else
 #  include <cutils/android_reboot.h>
+#  include <cutils/properties.h>
 #endif
 
 typedef struct stinfo stinfo;