crypto: sun8i-ce-cipher - use IS_ENABLED() checks for debugfs stats

Add IS_ENABLED(CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG) checks before the
fallback counter updates to make sure the code is not included when
debugfs statistics support is not enabled.

Also, drop the existing ifdef guards, since 'struct sun8i_ce_alg_template'
is always defined, even with CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG disabled.

Signed-off-by: Ovidiu Panait <ovidiu.panait.oss@gmail.com>
Tested-by: Corentin LABBE <clabbe.montjoie@gmail.com>
Acked-by: Corentin LABBE <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>