drm/i915/xe2lpd: Move D2D enable/disable

Bits to enable/disable and check state for D2D moved from
XELPDP_PORT_BUF_CTL1 to DDI_BUF_CTL (now named DDI_CTL_DE in the spec).
Make the functions mtl_ddi_disable_d2d() and mtl_ddi_enable_d2d generic
to work with multiple reg location and bitfield layout.

v2: Set/Clear XE2LPD_DDI_BUF_D2D_LINK_ENABLE in saved_port_bits when
    enabling/disabling D2D so DDI_BUF_CTL is correctly programmed in
    other places without overriding these bits (Clint)
v3: Leave saved_port_bits alone as those bits are not meant to be
    modified outside of the port initialization. Rather propagate the
    additional bit in DDI_BUF_CTL to be set when that register is
    written again after D2D is enabled.

Cc: Matt Roper <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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