mdss: dsi: turn off phy power supply during static screen

Turn off dsi phy regulator and pmic phy power supply during
static screen for DSI revision 104.

Change-Id: Ieedfb7311863d2ad8ff4f01de3c269e8e3bb3234
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>