ASoC: Initialize val to avoid access garbage value

In DAPM, when booting up widgets connect variable
is sometimes initialized with value 1 even though
expected to be 0. This is due to val not initialized
locally in API dapm_set_mixer_path_status and can
result in using garbage value.

CRs-Fixed: 982805
Change-Id: I172558f64c19750c461befda3aa16ca6480ab507
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>
Signed-off-by: Meng Wang <mwang@codeaurora.org>