This patch removes the decalartion of rte_eventdev_driver from
rte_eventdev.h, as it not used anymore; pci_eventdev_skeleton_pmd
moved to use rte_pci_driver instead of rte_eventdev_driver.
Fixes: 7214438d93 ("eventdev: remove PCI dependency from generic structures")
Cc: stable@dpdk.org
Signed-off-by: Rami Rosen <rami.rosen@intel.com>