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: Idd88b2f71d3643dd84268891c4794df1557fc145