Restore correct registers in aarch64 AES-CTR code

Restore correct registers in aarch64 AES-CTR code

Commit 1d1ca79fe35dbe5c05faed5a2ef8c4de9c5adc49 introduced
save and restore for the registers, saving them as

	stp		d8,d9,[sp, #16]
	stp		d10,d11,[sp, #32]
	stp		d12,d13,[sp, #48]
	stp		d14,d15,[sp, #64]

But the restore code was inadvertently typoed:

	ldp		d8,d9,[sp, #16]
	ldp		d10,d11,[sp, #32]
	ldp		d12,d13,[sp, #48]
	ldp		d15,d16,[sp, #64]

Restoring [sp, #64] into d15,d16 instead of d14,d15.

Fixes: #26466
CLA: trivial

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26469)