radeonsi: set correct alignment for texture buffers and constant buffers
radeonsi: set correct alignment for texture buffers and constant buffers

I think these are all equivalent to vertex buffer fetches which should be
dword-aligned. Scalar loads are also dword-aligned.

Reviewed-by: Michel Dänzer <242b79f0804cf52679d58f27ed754158c1323c75@amd.com>

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