drm/amd/display: Add two dmmuy I2C entry for GPIO port mapping issue

[Why]
When only 4 I2C is declared, two dummies are required to correctly map
GPIO port.

[How]
Add one more I2C dummy entry to ma

drm/amd/display: Add two dmmuy I2C entry for GPIO port mapping issue

[Why]
When only 4 I2C is declared, two dummies are required to correctly map
GPIO port.

[How]
Add one more I2C dummy entry to match GPIO port.

Signed-off-by: Chris Park <[email protected]>
Reviewed-by: Alvin Lee <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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