msm: vidc: Correct debugfs directory name

Video instance pointer is used directly as a unique name for
the instance's corresponding debugfs directory. %pK will remove
the uniqueness and hence only first among any concurrent sessions
will be able to create a corresponding debugfs directory. Use %p
as the name is not directly revealed through prints.

Change-Id: I3a79950b76c1c38e487471f21dc60590b032dd3f
Signed-off-by: Abdulla Anam <abdullahanam@codeaurora.org>