drm/amdgpu: Add gfx v12_0 ip block support (v6)

Initial support for GFX 12.

v1: Add gfx v12_0 ip block support. (Likun)
v2: Switch to gfx.kiq array.
    Move the vmhub from ring callback to ring. (Hawking)
v3: Update various callback function impl. (Hawking)
v4: Warning fixes (Alex)
v5: squash in imu fix, csb, rlc autoload implementations (Alex)
v6: Rebase (Alex)

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/Makefile

@@ -167,7 +167,8 @@ amdgpu-y += \
 	imu_v11_0.o \
 	gfx_v11_0.o \
 	gfx_v11_0_3.o \
-	imu_v11_0_3.o
+	imu_v11_0_3.o \
+	gfx_v12_0.o
 
 # add async DMA block
 amdgpu-y += \