mediacodec: allow dir read in /vendor

See marlin Ib1b875bcfa0e8d2358303e4eb004983433b0a13a

Bug: 129270239
Change-Id: Iacb3a227fd09f5e2615ddd55aafb5169e32de368
diff --git a/shared/sepolicy/mediacodec.te b/shared/sepolicy/mediacodec.te
new file mode 100644
index 0000000..e26f128
--- /dev/null
+++ b/shared/sepolicy/mediacodec.te
@@ -0,0 +1 @@
+allow mediacodec system_file:dir r_dir_perms;