dma-mapping: add DMA_ATTR_CPU_CACHE_CLEAN

dma-mapping: add DMA_ATTR_CPU_CACHE_CLEAN

[ Upstream commit 61868dc55a119a5e4b912d458fc2c48ba80a35fe ]

When multiple small DMA_FROM_DEVICE or DMA_BIDIRECTIONAL buffers share a
cacheline, and DMA_API_DEBUG is enabled, we get this warning:
	cacheline tracking EEXIST, overlapping mappings aren't supported.

This is because when one of the mappings is removed, while another one
is active, CPU might write into the buffer.

Add an attribute for the driver to promise not to do this, making the
overlapping safe, and suppressing the warning.

Message-ID: <2d5d091f9d84b68ea96abd545b365dd1d00bbf48.1767601130.git.mst@redhat.com>
Reviewed-by: Petr Tesarik <ptesarik@suse.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Stable-dep-of: 3d48c9fd78dd ("dma-debug: suppress cacheline overlap warning when arch has no DMA alignment requirement")
Signed-off-by: Sasha Levin <sashal@kernel.org>