drm/msm/disp/dpu1: fix warn stack reported during dpu resume

WARN_ON was introduced by the below commit to catch runtime resumes
that are getting triggered before icc path was set.

"drm/msm/disp/dpu1: icc path needs to be set before dpu runtime resume"

For the targets where the bw scaling is not enabled, this WARN_ON is
a false alarm. Fix the WARN condition appropriately.

Reported-by: Steev Klimaszewski <steev@kali.org>
Signed-off-by: Kalyan Thota <kalyan_t@codeaurora.org>