msm: sde: parse IOMMU SIDs from the device tree

Parse the SIDs from device tree and pass the correct
secure SID during scm_call. This removes the hard-coding
of SIDs. Remove unnecessary ifdef check on secure camera
preview VMID.

Change-Id: I92d1abc2d289cbaf4d39b618e07efff144616ba0
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>