drm/amdgpu/swsmu: drop smu i2c bus on navi1x

drm/amdgpu/swsmu: drop smu i2c bus on navi1x

commit 10105d0c9763f058f6a9a09f78397d5bf94dc94c upstream.

Stop registering the SMU i2c bus on navi1x.  This leads to instability
issues when userspace processes mess with the bus and also seems to
cause display stability issues in some cases.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1314
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1341
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>