sepolicy: Set correct policy for display in qti_init_shell

- Allow qti_init_shell to access gpu device, which is needed
for detect presence of gpu in handling targets w/o gpu
- Define property rules for sdm property in qti_init_shell

Change-Id: I4a2dc759fbdee5fb8cde2079bc368e9126343407
Crs-fixed: 1057262