msm: vidc: Return EINVAL for SMMU fault handler

Currently we are returning 0 in SMMU fault handler.
However, if we return -EINVAL, then smmu driver assumes
page fault handler is not installed and prints a list of
useful debug information.

CRs-Fixed: 2344373
Change-Id: I3ca6731eb9a30b7d4ef03f4d580e622d9a8c6c0f
Signed-off-by: Vaibhav Deshu Venkatesh <vdeshuve@codeaurora.org>