soc: qcom: msm_smem: Pass device structure to ramdump driver

The ramdump driver uses the device pointer during ramdump read.
This change passes in the device pointer for smem during
ramdump create and moves the call to the probe function.

CRs-Fixed: 1075262
Change-Id: I6234e35d76440beb53c139ad0b02ec8b49c2a196
Signed-off-by: Chris Lew <clew@codeaurora.org>