privapp-permissions: Update PREVENT_POWER_KEY permission for Camera

* Required after: https://review.lineageos.org/q/topic:%22power_key_prevent_cts%22+(status:open%20OR%20status:merged)



Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Change-Id: I6797fd38ac3da9fa70fc42cef1cf626aa48030a8