drm/amdgpu: move error log from ring write to commit

Move the error message from ring write as an optimization
to avoid printing that message on every write instead
print once during commit if it exceeds write the allocated
size i.e ring->count_dw.

Also we do not want to log the error message in between a
ring write and complete the write as its mostly not harmful
as it will overwrite stale data only as GPU read from ring
is faster than CPU write to ring.

This reduces the size of amdgpu.ko module by around
600 Kb as write is very often used function and hence
the print.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Suggested-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>