system/core: drop or replace log/logger.h

debuggerd does not require log/logger.h, can use android/log.h
In some cases, mark why log/logger.h was required.

Test: Compile and boot smoke test
Bug: 26552300
Bug: 31289077
Bug: 31456426
Change-Id: Ia34987e25a01d81971ec8d785415f732b8376c4f
diff --git a/debuggerd/signal_sender.cpp b/debuggerd/signal_sender.cpp
index 4be7e6e..3adbef2 100644
--- a/debuggerd/signal_sender.cpp
+++ b/debuggerd/signal_sender.cpp
@@ -24,7 +24,7 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
-#include <log/logger.h>
+#include <android/log.h>
 
 #include "signal_sender.h"