Change the DMA event line macros to have the name of the SoC.  Also,
have the event line number encoded in the macro since on DB5500 several
event lines are present at multiple alternate numbers.
Acked-by: NLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: NRabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>