Revert "drm/amdgpu/display: set vblank_disable_immediate for DC"

Revert "drm/amdgpu/display: set vblank_disable_immediate for DC"

commit a775e4e4941bf2f326aa36c58f67bd6c96cac717 upstream.

This reverts commit 92020e81ddbeac351ea4a19bcf01743f32b9c800.

This causes stuttering and timeouts with DMCUB for some users
so revert it until we understand why and safely enable it
to save power.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1887
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>