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/parser.cpp b/init/parser.cpp
index 45862b7..5953a88 100644
--- a/init/parser.cpp
+++ b/init/parser.cpp
@@ -4,7 +4,7 @@
 #include <stdio.h>
 #include <string.h>
 
-#include "log.h"
+#include <android-base/logging.h>
 
 void parse_error(struct parse_state *state, const char *fmt, ...)
 {