liblog: split out transports into separate files

Create config_logger, logger and logger_read to house the log
interfaces. Add fake_logger, logd_logger and pmsg_logger to
house the write and read transports. Allows for an easier and
direct path to add new transports to the library.

SideEffects: None, logger benchmark performance unaffected

Bug: 27176738
Bug: 27405083
Change-Id: I01b38637334a5242905c8c89f6ab0a92e2540008
diff --git a/liblog/log_is_loggable.c b/liblog/log_is_loggable.c
index 47fde20..551fa76 100644
--- a/liblog/log_is_loggable.c
+++ b/liblog/log_is_loggable.c
@@ -23,7 +23,7 @@
 
 #include <android/log.h>
 
-#include "log_cdefs.h"
+#include "log_portability.h"
 
 static pthread_mutex_t lock_loggable = PTHREAD_MUTEX_INITIALIZER;