asoc: bolero: remove extra semi-colon to avoid compile error

Remove extra semi-colon from wsa_macro_set_spkr_gain_offset to
avoid compile error when wsa-macro is disabled.

Change-Id: Ic94e78822639d70a365c714ad7dd0b2091de8179
Signed-off-by: Meng Wang <mengw@codeaurora.org>