disp: msm: avoid sde_dbg HW access based on HW ownership

Add VM ownership checks before accessing the HW through the debugfs
path in sde dbg module to avoid illegal access. Set the ownership
status on bootup based on the VM.

Change-Id: I30f2a1eb7e049740f1f7fe3ed03aa411264ba7b3
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>