MIPS: lantiq: pass struct device to DMA API functions

The DMA API generally relies on a struct device to work properly, and
only barely works without one for legacy reasons.  Pass the easily
available struct device from the platform_device to remedy this.

Also use GFP_KERNEL instead of GFP_ATOMIC as the gfp_t for the memory
allocation, as we aren't in interrupt context or under a lock.

Note that this whole function looks somewhat bogus given that we never
even look at the returned dma address, and the CPHYSADDR magic on
a returned noncached mapping looks "interesting".  But I'll leave
that to people more familiar with the code to sort out.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: John Crispin <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: Dmitry Tarnyagin <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Sudip Mukherjee <[email protected]>
Cc: Felipe Balbi <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

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