drm/amd/display: Add clock types to applying clk for voltage

Add DCF and FCLK clock case statements for changing raven's
clocks for voltage request.
Also maintain DCEF clock for DCE120 calls.

Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>