clk: msm: hdmi: add 8998 hdmi pll calculator and clocks

Add PLL and PHY programming for HDMI. Dynamically calculate
the register values to be programmed for a given pixel clock.

CRs-Fixed: 1022772
Change-Id: Ibf7877eb6edd29baefee57bc12188989d897d47e
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>
Signed-off-by: Narendra Muppalla <narendram@codeaurora.org>