disp: msm: sde: fix prefill line calculation for high fps

Fix prefill line calculation for high refresh rate
usecase and define correct number of prefill lines
for lahaina target.

Change-Id: Ib3467b9beb43de9c5faa2b1af2d8873a89c9c481
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>