liblog: remove visibility macros

Visibility is managed through version scripts now.

Bug: 123349183
Test: build
Change-Id: Ia388611a2ec14d0ff9c3896cfe97ccdce17dbb8b
diff --git a/liblog/logd_writer.cpp b/liblog/logd_writer.cpp
index ed906b3..c3f72f4 100644
--- a/liblog/logd_writer.cpp
+++ b/liblog/logd_writer.cpp
@@ -48,7 +48,7 @@
 static void logdClose();
 static int logdWrite(log_id_t logId, struct timespec* ts, struct iovec* vec, size_t nr);
 
-LIBLOG_HIDDEN struct android_log_transport_write logdLoggerWrite = {
+struct android_log_transport_write logdLoggerWrite = {
     .node = {&logdLoggerWrite.node, &logdLoggerWrite.node},
     .context.sock = -EBADF,
     .name = "logd",