dma-debug: store a phys_addr_t in struct dma_debug_entry

[ Upstream commit 9d4f645a ]

dma-debug goes to great length to split incoming physical addresses into
a PFN and offset to store them in struct dma_debug_entry, just to
recombine those for all meaningful uses.  Just store a phys_addr_t
instead.

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>