audio: Add 48khz sampling rate to spkr prot tx uc

With 8Khz sampling rate afe fails to fetch calibration
information.
sdm660 & msm8998 acdb supports only 48Khz for speaker
protection calibration tx device, since 8Khz tables were
not added initially, addition of 8Khz would require
further tuning.
This change is to use sample rate based on property, the
default sample rate is not changed for other targets without
prop.

Change-Id: I29dc549c699396fc953f3f831cd0ea81ee033ae4