disp: msm: eDP continuous splash implementation

For continuous splash use case bootloader already takes
care of eDP hardware states including clocks and regulators.
This change avoid touching eDP hardware blocks during
eDP initialization sequence.

Change-Id: I23635b43ce2a41078383bbcc89aa3f60564599dd
Signed-off-by: Sai Srujana Oruganti <quic_osaisruj@quicinc.com>