iommu: msm_iommu_sec: Add support for new scm_call2 API

The scm_library has added support for a new secure world
interface which is more aligned to the ARMv8 SMC calling
convention. This new api support was missing for the
dump fault register dumping code.

CRs-Fixed: 749979
Change-Id: I2b6d4f65ee6a59af677dfd109976053768de2b80
Signed-off-by: Neeti Desai <neetid@codeaurora.org>