vkupload: use a generic pipeline stage mask
In the case of ANV, the encode/decode queue does not support TRANSFER so the validation layer complains with VUID-vkCmdPipelineBarrier2-srcStageMask-03849
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In the case of ANV, the encode/decode queue does not support TRANSFER so the validation layer complains with VUID-vkCmdPipelineBarrier2-srcStageMask-03849