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/logprint.c b/liblog/logprint.c
index 02df8dd..d7de864 100644
--- a/liblog/logprint.c
+++ b/liblog/logprint.c
@@ -34,7 +34,7 @@
 #include <log/logprint.h>
 #include <private/android_filesystem_config.h>
 
-#include "log_cdefs.h"
+#include "log_portability.h"
 
 #define MS_PER_NSEC 1000000
 #define US_PER_NSEC 1000