qdsp5v2: Remove unused SEMC devices

Remove:
* handset_skt_rx
* handset_vzw_rx
* handset_skt_tx
* handset_vzw_tx
* handset_dual_mic_endfire_skt_tx
* handset_dual_mic_endfire_vzw_tx
* handset_asr_tx
* xloud_speaker_stereo_rx
* xloud_speaker_mono_rx