sdm: Fail core creation on DRMManagerInterface fatal errors

Currently if any issue occurs with opening msm_drm the
DRMManagerInterface will be null, but it is later used without any null
checks. As this is a critical resource, fail creation of core instead.

Change-Id: I1e8120089047798449ae2088c3ddff25004b4a16
CRs-Fixed: 2323370
6 files changed