system/core Replace log/log.h with android/log.h

Should use android/log.h instead of log/log.h as a good example
to all others.  Adjust header order to comply with Android Coding
standards.

Test: Compile
Bug: 26552300
Bug: 31289077
Change-Id: I33a8fb4e754d2dc4754d335660c450e0a67190fc
diff --git a/libbacktrace/BacktraceLog.h b/libbacktrace/BacktraceLog.h
index 5c39f1c..0a27982 100644
--- a/libbacktrace/BacktraceLog.h
+++ b/libbacktrace/BacktraceLog.h
@@ -19,7 +19,7 @@
 
 #define LOG_TAG "libbacktrace"
 
-#include <log/log.h>
+#include <android/log.h>
 
 // Macro to log the function name along with the warning message.
 #define BACK_LOGW(format, ...) \