liblog: split out transports into separate files

(cherry pick from commit 018a96d03f0d452bf078084eedcd5693da42308d)

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/uio.c b/liblog/uio.c
index d0184dc..ac0558f 100644
--- a/liblog/uio.c
+++ b/liblog/uio.c
@@ -20,7 +20,7 @@
 
 #include <log/uio.h>
 
-#include "log_cdefs.h"
+#include "log_portability.h"
 
 LIBLOG_ABI_PUBLIC int readv(int fd, struct iovec *vecs, int count)
 {