torch: blank white screen for devices without hardware torch

boolean "hasNoHardwareFlash" needs to be explicitly set true on device overlays

default is false as most devices we support do have a hardware torch.

Change-Id: Id18b7ffde7eeda16931497ce9ead35262dc7cf1c
Signed-off-by: Arnav Gupta <championswimmer@aokp.co>