drm/amdgpu/gfx11: rename gfx_v11_0_gfx_init_queue()

Rename to gfx_v11_0_kgq_init_queue() to better align with
the other naming in the file.

Acked-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>