drm/amd/display: Bump minimum for frame_warn_limit

drm/amd/display: Bump minimum for frame_warn_limit

[Why]
The bigger of CONFIG_FRAME_WARN and frame_warn_limit is used to
trigger warnings about large stack frames.  The dml_core_mode_support()
stack frame has grown to 2056.

[How]
Update frame_warn_limit to 2056 so that CONFIG_FRAME_WARN of 2048 doesn't
cause a failure.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4609
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Mario Limonciello <superm1@kernel.org>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>