net/sfc/base: fix warnings from VS2015 C compiler (C4100)

net/sfc/base: fix warnings from VS2015 C compiler (C4100)

Fix multiple level 4 warnings
"C4100: 'xxx': unreferenced formal parameter"
no functional changes.

The _NOTE(ARGUNUSED(xxx)) annotations are being exposed to the Visual
Studio 2015 C compiler with the following:

    #define _NOTE_ARGUNUSED(...) UNREFERENCED_PARAMETER((__VA_ARGS__));
    #define _NOTE(_annotation)   _NOTE_ ## _annotation

Fixes: 099c33bef343 ("net/sfc/base: import MCDI proxy authorization")
Fixes: e7cd430c864f ("net/sfc/base: import SFN7xxx family support")
Fixes: 7243cc0869f8 ("net/sfc/base: import software per-queue statistics")
Fixes: d96a34d165b1 ("net/sfc/base: import NVRAM support")
Fixes: 05fce2ce8451 ("net/sfc/base: import libefx licensing")
Cc: stable@dpdk.org
Signed-off-by: Andrew Lee <alee@solarflare.com>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>