Move microdroid sepolicy to system/sepolicy

Bug: 190511750
Test: boot microdroid
Change-Id: I4aa4a56e9be5103d70469c3508110a973f3e4f12
diff --git a/microdroid/system/public/logcat.te b/microdroid/system/public/logcat.te
new file mode 100644
index 0000000..902fd8a
--- /dev/null
+++ b/microdroid/system/public/logcat.te
@@ -0,0 +1,2 @@
+type logcat;
+type logcat_exec, file_type, exec_type, system_file_type;