msm: mdss: hdmi: add support for vesa formats

Add support for VESA formats at pixel frequencies
of 65MHz and 108MHz. These pixel frequencies are
required to support VESA(DVI) video formats, in
particular, add support for 1024x768p and 1280x1024p
video formats. These formats are supported on many
existing monitors.

CRs-Fixed: 438028
Change-Id: Ibe55648f32fface8ab310a431e9fb670085a86f7
Signed-off-by: Manoj Rao <manojraj@codeaurora.org>