Remove MAX_REGISTER_SIZE from aarch64-tdep.c

[Yao Qi]

Alan Hayward <Alan.Hayward@arm.com> writes:

> Ok to commit?
>
> 2017-06-07  Alan Hayward  <alan.hayward@arm.com>
>
> 	* aarch64-tdep.c (aarch64_store_return_value): Use
> 	V_REGISTER_SIZE.
> 	(aarch64_pseudo_read_value): Likewise.
> 	(aarch64_pseudo_write): Likewise.

OK.

-- 
Yao (齐尧)