disp: msm: dsi: avoid debugfs HW access based on HW ownership

Add VM ownership checks before accessing the HW through the debugfs
path in dsi display/ctrl modules to avoid illegal access.

Change-Id: Ia6e2ab0ef60d0f11e5945a63885d939db2ef78b0
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>