hal: spk_prot: remove cond_wait for spkr_calib_cancel

When exiting from spkr_calibrate API, there is conditional
signal wait for calib cancel. This is not signalled until
next enable_snd_device(). conditional wait is not required
as calibration is already done, removing it.

CRs-Fixed: 992030
Change-Id: Ib760f0fc656d3cacd5af5b0e891fae8475a902c9