Zero-length arrays are deprecated[1] and we are moving towards
adopting C99 flexible-array members instead. So, replace zero-length
array declaration in struct aspeed_sham_ctx with flex-array
member.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [2].

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
Link: https://github.com/KSPP/linux/issues/78Signed-off-by: NGustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: NNeal Liu <neal_liu@aspeedtech.com>
Reviewed-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>