libselinux log messages usually end with a new line character. Android
log system does not require the new line character and will include the
character as-is in the log buffer.
selinux_log_callback and selinux_vendor_log_callback implementations are
merged as they provide similar functionalities.
Match the indentation (i.e., tabs) with the rest of the file.
Test: boot & inspect logcat
Change-Id: I0a5e53b8f048c65f29c5df3bd7e0b38f523e42cd
366f01fd64