eal: read and parse device option separately

eal: read and parse device option separately

When the EAL parses the common options given to the application,
not all subsystems are available. Some device drivers are registered
afterward upon dynamic plugin loading.

Devices using those drivers are thus unable to be parsed by any drivers
and are rejected.

Store the device options first and keep them for later processing.
Parse these right before initializing the buses, the drivers must have
been stabilized at this point.

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
Tested-by: Dirk-Holger Lenz <dirk.lenz@ng4t.com>