init: more header cleanup

Remove includes of "log.h" that really want <android-base/logging.h>
Fix header include order
Remove headers included in .cpp files that their associated .h already includes
Remove some unused headers

Test: boot bullhead
Change-Id: I2b415adfe86a5c8bbe4fb1ebc53c7b0ee2253824
diff --git a/init/service.h b/init/service.h
index d84ce02..5e89b9f 100644
--- a/init/service.h
+++ b/init/service.h
@@ -19,14 +19,13 @@
 
 #include <sys/types.h>
 
-#include <cutils/iosched_policy.h>
-
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include <android-base/chrono_utils.h>
+#include <cutils/iosched_policy.h>
 
 #include "action.h"
 #include "capabilities.h"