Allow sdcardfs:file read access on mediaextractor

Test: pass Multimedia File Compatibility test
Test: time to start playing mid file with GPM: ~10s => ~1.2s
Bug: 76422052, Bug: 67480585, Bug: 30751071
Merged-In: I4e9824b21dab1dafdcca5824367a7fe39a37e2f7
Change-Id: I4e9824b21dab1dafdcca5824367a7fe39a37e2f7

public/mediaextractor.te

@@ -22,10 +22,8 @@ allow mediaextractor proc_meminfo:file r_file_perms;
 
 crash_dump_fallback(mediaextractor)
 
-# Suppress denials from sdcardfs (b/67454004)
-dontaudit mediaextractor sdcardfs:file read;
-
 # allow mediaextractor read permissions for file sources
+allow mediaextractor sdcardfs:file { getattr read };
 allow mediaextractor media_rw_data_file:file { getattr read };
 allow mediaextractor app_data_file:file { getattr read };