v1: Add sdma v7_0 ip block support. (Likun)
v2: Move vmhub from ring_funcs to ring. (Hawking)
v3: Switch to AMDGPU_GFXHUB(0). (Hawking)
v4: Move microcode init into early_init. (Likun)
v5: Fix warnings (Alex)
v6: Squash in various fixes (Alex)
v7: Rebase (Alex)
v8: Rebase (Alex)