mdsp: msm: mdsp_ts: Add the probe func

Add the probe function of smd_ts driver, as we need
to compile this feature by default, and we'll decide
whether to enable it through device tree node.

Change-Id: I3c87ff084e32b5ec020f3a3d3ec030d072c95bf5
CRs-Fixed: 1046123
Signed-off-by: jiangjia <jiangjia@codeaurora.org>