net/sfc/base: refactor filter lookup loop in EF10
net/sfc/base: refactor filter lookup loop in EF10

The code is refactored to make it more clear and allow for
more convenient further changes.

Fixes: e7cd430c864f ("net/sfc/base: import SFN7xxx family support")
Cc: stable@dpdk.org

Signed-off-by: Igor Romanov <945ea196dab32ad63762a1b623439a95515e898a@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <ac94ab2a8fe9a9a087f6e24dcbc16626b52c07e8@solarflare.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk