drm/i915/dg2: use existing mechanisms for SNPS PHY translations

We use encoder->get_buf_trans() in many places, for example
intel_ddi_dp_voltage_max(), and the hook was set to some old platform's
function for DG2 SNPS PHY. Convert SNPS PHY to use the same translation
mechanisms as everything else.

Cc: Manasi Navare <[email protected]>
Cc: Matt Roper <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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