This reverts commit dac6b808.

This commit reverted the AMDGPU_SKIP_MODE2_RESET as it conflicts with
the original design of reset handler. Will redesign it.

Fixes: dac6b808 ("drm/amdgpu: let mode2 reset fallback to default when failure")
Signed-off-by: NVictor Zhao <Victor.Zhao@amd.com>
Reviewed-by: NLijo Lazar <lijo.lazar@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>