platform: msm: qcom-geni-se: Initialize driver at subsys stage

Perform the driver initialization at subsys stage in order to satisfy
the dependency on IOMMU.

CRs-Fixed: 2208528
Change-Id: Ibf2fb497a9d94f700222a977483f145b4fe36309
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>