dmaengine: axi-dmac: Enable TLAST handling

The TLAST flag is used by the DMAC HDL controller to signal to the
controller that the following segment (to be submitted) is the last one (in
a series of segments).

A receiver DMA (typically another DMAC) can read this parameter (from the
transfer), and terminate the transfer earlier. A typical use-case for this,
is when the receiver expects a certain amount of segments, but for some
reason (e.g. an ADC capture which can have an unknown number of digital
samples) the number of actual segments is smaller. The receiver would read
this flag, and then the DMAC would finish.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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