Move mediacodec to vendor partition.

Test: Camera, Photos, YouTube and Play Movies apps.
Bug: 35328855
Change-Id: I3643b668817a7336f7ccda781734920fbbcc2c63

private/file_contexts

@@ -196,7 +196,6 @@
 /system/bin/mediametrics	u:object_r:mediametrics_exec:s0
 /system/bin/cameraserver	u:object_r:cameraserver_exec:s0
 /system/bin/mediaextractor	u:object_r:mediaextractor_exec:s0
-/system/bin/mediacodec	u:object_r:mediacodec_exec:s0
 /system/bin/mdnsd	u:object_r:mdnsd_exec:s0
 /system/bin/installd	u:object_r:installd_exec:s0
 /system/bin/otapreopt_chroot   u:object_r:otapreopt_chroot_exec:s0

vendor/file_contexts

@@ -20,6 +20,7 @@
 /(vendor|system/vendor)/bin/hw/android\.hardware\.light@2\.0-service          u:object_r:hal_light_default_exec:s0
 /(vendor|system/vendor)/bin/hw/android\.hardware\.memtrack@1\.0-service       u:object_r:hal_memtrack_default_exec:s0
 /(vendor|system/vendor)/bin/hw/android\.hardware\.nfc@1\.0-service            u:object_r:hal_nfc_default_exec:s0
+/(vendor|system/vendor)/bin/hw/android\.hardware\.media\.omx@1\.0-service            u:object_r:mediacodec_exec:s0
 /(vendor|system/vendor)/bin/hw/android\.hardware\.power@1\.0-service          u:object_r:hal_power_default_exec:s0
 /(vendor|system/vendor)/bin/hw/android\.hardware\.sensors@1\.0-service        u:object_r:hal_sensors_default_exec:s0
 /(vendor|system/vendor)/bin/hw/rild                                           u:object_r:rild_exec:s0