drivers: dma-removed: align size first

Align size first and then find required number of bits and
order out of it.

Change-Id: I9b12fb45e5c1ff79e24fe7584cd23923b1a88c87
Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>