asm-generic: add dma-mapping-linear.h

This adds a version of the dma-mapping API to asm-generic that can be
used by most architectures that only need a linear mapping.

An architecture using this still needs to provide definitions for
dma_get_cache_alignment, dma_cache_sync and a new dma_coherent_dev
function as well as out-of-line versions of dma_alloc_coherent and
dma_free_coherent.

Thanks to Fujita-san for an endless supply of feedback.

Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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