crypto: sun8i-ce - remove unnecessary __maybe_unused annotations

There are 3 instances of '__maybe_unused' annotations that are not needed,
as the variables are always used, so remove them.

Signed-off-by: Ovidiu Panait <ovidiu.panait.oss@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>