DMAENGINE: ste_dma40: add DB8500 memcpy channels

This adds all available memcpy channels to the DB8500 in the
ux500 platform (and fixes a typo).

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>