dma-mapping: trace dma_alloc/free direction

[ Upstream commit 3afff779 ]

In preparation for using these tracepoints in a few more places, trace
the DMA direction as well. For coherent allocations this is always
bidirectional.

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Stable-dep-of: 7e2368a2 ("dma-debug: don't enforce dma mapping check on noncoherent allocations")
Signed-off-by: Sasha Levin <sashal@kernel.org>