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/devices.h b/init/devices.h
index 26a064b..83f0eef 100644
--- a/init/devices.h
+++ b/init/devices.h
@@ -17,9 +17,10 @@
 #ifndef _INIT_DEVICES_H
 #define _INIT_DEVICES_H
 
-#include <functional>
 #include <sys/stat.h>
 
+#include <functional>
+
 enum coldboot_action_t {
     // coldboot continues without creating the device for the uevent
     COLDBOOT_CONTINUE = 0,