Update audio.h

fix error if define ICS_AUDIO_BLOB.
system/core/include/system/audio.h:520:32: error: 'AUDIO_DEVICE_IN_FM_RX' undeclared here (not in a function)
                                AUDIO_DEVICE_IN_FM_RX |
                                ^
system/core/include/system/audio.h:521:32: error: 'AUDIO_DEVICE_IN_FM_RX_A2DP' undeclared here (not in a function)
                                AUDIO_DEVICE_IN_FM_RX_A2DP |
                                ^