dmaengine: Revert "dmaengine: add verification of DMA_INTERRUPT capability for dmatest"

This reverts commit a8facc7b ("dmaengine: add verification of
DMA_INTERRUPT capability for dmatest") as it causes regression due to
the fact that DMA_INTERRUPT in linked to dma_prep_interrupt() so
checking that is incorrect here

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20220606174906.3979283-1-vkoul@kernel.org


Signed-off-by: Vinod Koul <vkoul@kernel.org>