sepolicy: fix file.te

device/htc/msm7x30-common/sepolicy/file.te":8:ERROR 'duplicate declaration of type/attribute' at token ';' on line 7519:

type audio_firmware_file, file_type;
checkpolicy:  error(s) encountered while parsing configuration

Change-Id: I5d6c030903c6574fd5e4e75fd06309883a0e8a4b