asoc: codecs: set boost state to MAX_STATE_2 for WSA8815

WSA8815 requires default boost state of MAX_STATE_2, when
speaker protection feature is disabled. Set boost state to
MAX_STATE_2 in all cases for WSA8815.

Change-Id: Ic700d9a206e94a4cdd1d99f8547bed9df1e759e8
Signed-off-by: Xiaojun Sang <xsang@codeaurora.org>