Substitute driver-defined IS_P2ALIGNED() with EFX_IS_P2ALIGNED()
defined in libefx.
Add type argument and cast value and alignment to one specified type.
Fixes: e1b944598579 ("net/sfc: build libefx")
Cc: stable@dpdk.org
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>