Refactor libinit_test_utils to not use libinit and expose its libraries

Users of libinit_test_utils must include all libraries that it uses.
If it uses libinit, then there is a large number of libraries that
must be included.  To avoid this, make libinit_test_utils only use
init_common_sources and the small number of required libraries that go
along with those sources.  Additionally, expose these sources as a
default for users of libinit_test_utils.

Test: build
Change-Id: I224fa7e0590d073e4cd40412b5dcb6f72a64b6bf
diff --git a/init/service.cpp b/init/service.cpp
index 665a1b0..b12d11a 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -40,7 +40,7 @@
 #include "service_list.h"
 #include "util.h"
 
-#if defined(__ANDROID__)
+#ifdef INIT_FULL_SOURCES
 #include <ApexProperties.sysprop.h>
 #include <android/api-level.h>
 
@@ -303,7 +303,7 @@
         return;
     }
 
-#if defined(__ANDROID__)
+#if INIT_FULL_SOURCES
     static bool is_apex_updatable = android::sysprop::ApexProperties::updatable().value_or(false);
 #else
     static bool is_apex_updatable = false;