asoc: remove deprecated dummy functions in DAP modules

File "msm-ds2-dap-config.c" has corresponding dummy functions defined
for all of its functions to avoid compilation error when config flags
"CONFIG_DOLBY_LICENSE" and "CONFIG_DOLBY_DS2" are not selected for a
target. However, this file will not get compiled when these two flags
are not selected. Therefore, those dummy functions are useless and
should be removed.

Change-Id: Ic53a6a9d87d6fd56560af1aec3dc012d6486b42a
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>