ARM: dts: msm: fix min refresh rate for sharp dual dsi panel

30 fps is invalid minimum refresh rate for sharp dual dsi
panel. It supports 53 fps as minimum refresh rate. This
change fixes it.

Change-Id: I6fe87f3592c4cdd4fe9863d01d714122179751c7
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>