dsp: Fix AFE RTC set parameter

Fix offset address to use set parameter structure while
copying data from user instead of get parameter structure
for AFE_PORT_CMD_SET_PARAM_V3 case.

CRs-Fixed: 2256728
Change-Id: I61e41f366f365734a47080b79179fbe3021ee8a7
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>