drm/amd/display: update dcn351 used clock offset

[ Upstream commit a1fc2837 ]

[why]
hw register offset delta

Reviewed-by: Martin Leung <martin.leung@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: f88192d2 ("drm/amd/display: Correct register address in dcn35")
Signed-off-by: Sasha Levin <sashal@kernel.org>