drm/amd/powerplay: introduce smu clk type to handle ppclk for each asic

drm/amd/powerplay: introduce smu clk type to handle ppclk for each asic

This patch introduces new smu clk type, it's to handle the different ppclk
defines for each asic with the same smu ip.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>