radeonsi: cleanup disabling tiling for UVD v3
radeonsi: cleanup disabling tiling for UVD v3

Should fix: https://bugs.freedesktop.org/show_bug.cgi?id=63702

v2: add a comment that this is just a workaround
v3: fix typo in comment

Signed-off-by: Christian König <c7ea837d7a46effe4232b086213468b8b31643bf@amd.com>
Reviewed-by: Michel Dänzer <242b79f0804cf52679d58f27ed754158c1323c75@amd.com>

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