drm/amd/display: dc/gpio: add support for DCE6 (v2)

[Why]
hw_factory.c requires changes for DCE6 support

[How]
DCE6 targets added replicating and adapting existing DCE8 implementation.

(v2) change

drm/amd/display: dc/gpio: add support for DCE6 (v2)

[Why]
hw_factory.c requires changes for DCE6 support

[How]
DCE6 targets added replicating and adapting existing DCE8 implementation.

(v2) changes due to following commit:
91db931 ("drm/amd/display: refactor gpio to allocate hw_container in constructor")

Reviewed-by: Alex Deucher <[email protected]>
Signed-off-by: Mauro Rossi <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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