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/descriptors.cpp b/init/descriptors.cpp
index 6e457cd..bc6bc8d 100644
--- a/init/descriptors.cpp
+++ b/init/descriptors.cpp
@@ -19,16 +19,15 @@
 #include <ctype.h>
 #include <fcntl.h>
 #include <sys/stat.h>
-#include <sys/types.h>
 #include <unistd.h>
 
+#include <android-base/logging.h>
 #include <android-base/stringprintf.h>
 #include <android-base/unique_fd.h>
 #include <cutils/android_get_control_file.h>
 #include <cutils/sockets.h>
 
 #include "init.h"
-#include "log.h"
 #include "util.h"
 
 DescriptorInfo::DescriptorInfo(const std::string& name, const std::string& type, uid_t uid,