drm/amdgpu/display: restore AUX_DPHY_TX_CONTROL for DCN2.x

stable inclusion
from stable-5.10.27
commit dc28098f40b44705389fcae8596dc6a7668a95b3
bugzilla: 51493

--------------------------------

commit 5c458585 upstream.

Commit 09821499 added fetching of the AUX_DPHY register
values from the vbios, but it also changed the default values
in the case when there are no values in the vbios.  This causes
problems with displays with high refresh rates.  To fix this,
switch back to the original default value for AUX_DPHY_TX_CONTROL.

Fixes: 09821499 ("drm/amd/display: Read VBIOS Golden Settings Tbl")
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1426


Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Igor Kravchenko <Igor.Kravchenko@amd.com>
Cc: Aric Cyr <Aric.Cyr@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by:   Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>