The reason for not building is updated
to be consistent with other drivers.
The libibverbs was not detected through pkg-config.
The method dependency() needs to be used first.
The support in rdma-core and Linux is not released yet,
so the documentation is updated.
Fixes: 517ed6e2d590 ("net/mana: add basic driver with build environment")
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
df1982df8b