anv: Fix output of INTEL_DEBUG=bat for chained batches

Caio Oliveira requested to merge cmarcelo/mesa:r/anv-intel-bat into master

The anv_batch_bo contents are linked one to another, and when printing we have to start with the first of those. Since in u_vector new elements are added to the head, to get the first element we need the vector's tail.

Fixes: 32ffd900 ("anv: add support for INTEL_DEBUG=bat")

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