msm: mdss: update panel info node with dynamic fps parameters

Update the panel info node with dynamic fps feature parameters
for userspace to use. Also, expose minimum and maximum refresh
rate supported by the panel through panel info node.

Change-Id: I0f540faf8fabf951d03f2211e4fbbc9a7e71f457
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>