net/sfc: remove dedicated init log parameter

net/sfc: remove dedicated init log parameter

The previous patches in the set convert per-port
logging to use NOTICE level and make this level default.
This provides the possibility to remove the dedicated
toggle for init-related messages and merge init logging
with the main log type. In order to keep these logs silent
by default, INFO level should be used.

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@solarflare.com>