drm/msm/dsi-staging: add regulator name to error log

This change makes error log more informative by adding
regulator name.

Change-Id: I3567f26e3bfc2645ed300a3520cd5ee042eae9a3
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>
1 file changed