drm/amdgpu: Use memset32 for SDMA padding

Instead of open coding it via the inefficient amdgpu_ring_write(), which
which the compiler is not able to optimise much, we can add a new
amdgpu_ring_fill() helper which pads using memset32. We do this by moving
the existing implementation from amdgpu_ring_insert_nop(), which is used
by the GFX rings, and then individually convert all the SDMA insert_nop
implementations.

For SDMA this should have a lesser benefit than for GFX (only SDMA v4.0
uses the 256 byte ring padding while the rest use 16), but it does not
harm to be consistent.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Cc: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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