msm: mdss: add support dynamic resolution switch

Provide support for panel drivers to expose multiple panel timings
supported and expose this through existing fb sysfs mode nodes.
When switching between resolutions allow seamless transition between the
modes.

Change-Id: Iad660a47ea0a63ca0d2332339727b8fcd005dac6
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>