ASoC: wcd934x: Fix register default for MAD buffer interval

Current register default setting for MAD buffer interval is incorrect
and hence microphone activity detection is not functional. Update the
default value of the MAD buffer interval to 10msec.

CRs-Fixed: 1049012
Change-Id: I1dcdcb566f096bbddad286dc71c5bf980303e4c3
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>