clock-mdss-8974: Switch HDMI clocks to use the new PLL implementation

This change cleans up the HDMI VCO/PLL implementation. It implements
the HDMI VCO clock and uses generic div and mux clocks to align to
the HDMI PLL architecture.

CRs-Fixed: 456315
Change-Id: I19ef344aafc954935cd6d236f3725bf168658ec9
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>