ARM: dts: msm: fix secondary mic bug for qrd 8953

QRD 8953 uses MIC BIAS3 for secondary mic.
As secondary mic doesn't share data line with primary one,
DMIC2 is used instaed of DMIC1.
Update device tree accordingly.

CRs-Fixed: 991341
Signed-off-by: Xiaojun Sang <xsang@codeaurora.org>
Change-Id: I891bd6cb7d7396e4b67f5c16d22a09ac16ef68b7