Revert "drm/amdgpu: Only update the CUR_SIZE register when necessary"

Revert "drm/amdgpu: Only update the CUR_SIZE register when necessary"

This reverts commits fb3df287ede6f79d1245098f5409089c106a9a6c and
97554bdfa188c0fc54663624944390111013a3f4.

They caused the HW cursor to disappear under various circumstances in
the wild. I wasn't able to reproduce any of them, and I'm not sure
what's going on. But those changes aren't a big deal anyway, so let's
just revert for now.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=191291
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99143
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>