drm: drm bootsplash enable for display port

This change contain change related to drm bootsplash on
display port. After handling HPD connection state, call
drm client register function but before framework is ready.

Change-Id: I50552a5ec2f5b69edff9d6a5c59759bcafd9e37b
Signed-off-by: Shubham Talekar <stalek@codeaurora.org>