drm/amd/amdgpu: Tidy up SI SMC code (v2)

drm/amd/amdgpu: Tidy up SI SMC code (v2)

As well as merge SMC clock functions into one to reduce LOC.

v2: Fix swapped ck enable bit
bug: https://bugs.freedesktop.org/show_bug.cgi?id=97801

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>