Missing else in cipher_hw_aes_ocb_generic_initkey

Missing else in cipher_hw_aes_ocb_generic_initkey

This came from commit 3837c202 "Add aes_ocb cipher to providers". It
causes the default non-hardware accelerated AES implementation to be
used even if HWAES_CAPABLE is set. Affects all platforms except X86 and
SPARC.

Patch by: Nick Gasson <Nick.Gasson@arm.com>
Change-Id: I26001a3a922ff23f6090fdcefefaecf68e92e2a6

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/10012)