defconfig: msm: Enable SMD packet driver for msm8996-auto

SMD packet driver provide access to SMD resources from the
user space through device nodes.

CRs-Fixed: 2223967
Change-Id: I3d458493994f877bfc0bf252ad9e1d5f5e180138
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>