net/sfc: use eal I/O device memory read/write API
net/sfc: use eal I/O device memory read/write API

Use relaxed version of these functions to guarantee no changes on
the step.

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

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