dsp: Remove lock in voice_map_cal_memory

voice_map_cal_memory is already under
locked context of common_lock from fn
voc_register_vocproc_vol_table from where
it is invoked.
Remove locking the same lock again in
voice_map_cal_memory to avoid deadlock.

Change-Id: Ibd6c7169377418c7bda3310a0e422279fd4e7295