regs: apply alphabetical formatting

while it is deterministic, it might be less readable
if anyone reads Yaml/Regs file, to verify correctness with datasheet
(in case no automatic conversion like svd to yaml is possible).
It also seems that formatting strips 'access' field from Regs.

Signed-off-by: Krzysztof Królczyk <[email protected]>

Author: kkrolczyk