net/sfc/base: fix build when EVB is enabled
net/sfc/base: fix build when EVB is enabled

Make local MCDI helper functions static.

Fixes: f0bda0cd680d ("net/sfc/base: add MCDI wrappers for vPort and vSwitch in EVB")
Fixes: ea94d14dbea0 ("net/sfc/base: provide APIs to configure and reset vPort")
Cc: stable@dpdk.org

Signed-off-by: Andrew Rybchenko <ac94ab2a8fe9a9a087f6e24dcbc16626b52c07e8@solarflare.com>

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