drm/amd/powerplay: enable gfxclk ds,dcefclk ds and fw dstate on navi10

drm/amd/powerplay: enable gfxclk ds,dcefclk ds and fw dstate on navi10

on navi10, by default the below four features are enabled.
gfxclk deep sleep: enabled and verified
fw dstate: enabled and then soc ulv is verified
dcefclk deep sleep: enabled and verified. notice that on different boards,
due to the minimum dcefclk deep sleep setting in VBIOS, we may not see dcefclk
deep sleep kicking in.

Signed-off-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>