drm/amd/display/dml2: use vzalloc rather than kzalloc

drm/amd/display/dml2: use vzalloc rather than kzalloc

[ Upstream commit cd9e6d6fdd2de60bfb4672387c17d4ee7157cf8e ]

The structures are large and they do not require contiguous
memory so use vzalloc.

Fixes: 70839da63605 ("drm/amd/display: Add new DCN401 sources")
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4126
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 20c50a9a793300a1fc82f3ddd0e3c68f8213fbef)
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>