crypto: stm32 - Replace min_t(size_t) with just min()

crypto: stm32 - Replace min_t(size_t) with just min()

In most cases, min_t(size_t) and explicit casting are unnecessary
because the values ->hw_blocksize, ->payload_{in,out}, and ->header_in
are already of type 'size_t'. Use the simpler min() macro instead.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>