Move mediatranscoding type to public

Move type to public so that it can be vendor customized. This
can be necessary if (for example) the gralloc/gpu same-process-HAL
requires additional permissions.

Bug: 199581284
Test: build
Change-Id: I61a5a3ad96112d4293fd4bf6d55f939c974643ce
diff --git a/private/mediatranscoding.te b/private/mediatranscoding.te
index d812525..6f7d027 100644
--- a/private/mediatranscoding.te
+++ b/private/mediatranscoding.te
@@ -1,5 +1,4 @@
 # mediatranscoding - daemon for transcoding video and image.
-type mediatranscoding, domain;
 type mediatranscoding_exec, system_file_type, exec_type, file_type;
 type mediatranscoding_tmpfs, file_type;
 typeattribute mediatranscoding coredomain;
diff --git a/public/mediatranscoding.te b/public/mediatranscoding.te
new file mode 100644
index 0000000..420d038
--- /dev/null
+++ b/public/mediatranscoding.te
@@ -0,0 +1 @@
+type mediatranscoding, domain;