drm/i915/icl: Get DDI clock for ICL based on PLLs.

PLLs are the source clocks for the DDIs so in order
to determine the ddi clock we need to check the PLL
configuration.

This gets a little tricky for ICL since there is
no register bit that maps directly to the link clock.
So this patch creates a separate function in intel_dpll_mgr.c
to obtain the write array PLL Params and compares the set
pll_params with the table to get the corresponding link
clock.

v2:
  - Fix the encoder type check (DK).
  - Improve our error checking, return a sane value (Mika, Paulo).
  - Fix table entries (Paulo).

Cc: Rodrigo Vivi <[email protected]>
Cc: Mika Kahola <[email protected]>
Cc: Paulo Zanoni <[email protected]>
Cc: Dhinakaran Pandiyan <[email protected]>
Reviewed-by: Mika Kahola <[email protected]>
Signed-off-by: Manasi Navare <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
[Paulo: implement v2]
Signed-off-by: Paulo Zanoni <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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