eal: hide internal hotplug function

eal: hide internal hotplug function

This API was experimental and not properly marked in the map file.
But looking more closely, this is just an internal wrapper for EAL init.
Hide it in the hotplug code.

Fixes: 244d5130719c ("eal: enable hotplug on multi-process")
Cc: stable@dpdk.org
Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Neil Horman <nhorman@tuxdriver.com>