msm: mdss: Parse continous splash status entry in panel

This change moves the "cont-splash-enable" entry parsing
in panel utiltiy library. It should be parsed in panel
utilitiy instead of dsi controller because this entry is
part of panel dtsi file.

Change-Id: If3aca0780d58adeecb48ac89c42dfc031a3efa30
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>