msm: mdss: Put smmu interface errors under pr_err

Some of the smmu interfaces error are under pr_debug
in splash logo path. Put them under pr_err.

Change-Id: I1805a4a00e3c2a2d2ed1772e84759c301b56b115
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>