qede: add core driver

qede: add core driver

The Qlogic Everest Driver for Ethernet(QEDE) Poll Mode Driver(PMD) is
the DPDK specific module for QLogic FastLinQ QL4xxxx 25G/40G CNA family
of adapters as well as their virtual functions (VF) in SR-IOV context.

This patch adds QEDE PMD, which interacts with base driver and
initialises the HW.

This patch content also includes:
 - eth_dev_ops callbacks
 - Rx/Tx support for the driver
 - link default configuration
 - change link property
 - link up/down/update notifications
 - vlan offload and filtering capability
 - device/function/port statistics
 - qede nic guide and updated overview.rst

Note that the follow on commits contain the code for the features mentioned
in documents but not implemented in this patch.

Signed-off-by: Harish Patil <harish.patil@qlogic.com>
Signed-off-by: Rasesh Mody <rasesh.mody@qlogic.com>
Signed-off-by: Sony Chacko <sony.chacko@qlogic.com>