gdb: migrate aarch64 to new gdbarch_pseudo_register_write

Make aarch64 use the new gdbarch_pseudo_register_write.  This fixes
writing pseudo registers to non-current frames on this architecture.

Change-Id: Ic012a0b95ae728d45a7121f77a79d604c23a849e
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Approved-By: Luis Machado <luis.machado@arm.com>
Tested-By: Luis Machado <luis.machado@arm.com>
1 file changed