r600g: allocate FMASK right after the texture, so that it's aligned with it
r600g: allocate FMASK right after the texture, so that it's aligned with it

This avoids the kernel CS checker errors with MSAA textures.

Reviewed-by: Jerome Glisse <0620d428a1bd3756b1319066bf466b3b8be0b2b2@redhat.com>

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