hal: Derive snd_device properly while sending app_type_config

Derive snd_device using platform_get_spkr_prot_snd_device without
checking for a specfic snd_device as the check is implicitly
handled in the function. Update the hw_interface for all the
speaker protected devices from SLIMBUS_4_TX to SLIMBUS_0_RX.

CRs-Fixed: 2019861
Change-Id: I01dbc585013e4943257873bc8650397c92de4842