drm/i915/icl: apply Display WA #1178 to fix type C dongles

Display WA #1178 is meant to fix Aux channel voltage swing too low with
some type C dongles. It applies to external ports on combo phy. On
Icelake this is port A and B when those are not eDP.

v2: follow the spec to the letter: include Aux A and just check if it's
    not eDP instead of checking only for Aux B.

Cc: Rodrigo Vivi <[email protected]>
Cc: Paulo Zanoni <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Imre Deak <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Reviewed-by: Imre Deak <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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