dma40: combine desc init functions
The desc init code can be shared between the mem and slave prep routines. Acked-by: NPer Forlin <per.forlin@stericsson.com> Acked-by: NJonas Aaberg <jonas.aberg@stericsson.com> Signed-off-by: NRabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: NLinus Walleij <linus.walleij@stericsson.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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