msm_fb : display : Add 60fps support for NT35516 qHD panel

This change adds the required support for 60fps using h/w vsync
in Command mode on NT35516 DSI Client. Panel Init comamnd has
been modified accordingly. Also, since the panel gives 59 to
61 TE signals per second, refx100 has also been modified to
indicate the maximum possible refresh rate with this panel.
This will ensure smooth operation of DMA Tear Check algorithm.

Change-Id: Ib2c03e61509946b7929c3cd21b497a972359fee3
Signed-off-by: Pradeep Jilagam <pjilagam@codeaurora.org>