ixgbe: devlink: add devlink region support for E610

Provide support for the following devlink cmds:
 -DEVLINK_CMD_REGION_GET
 -DEVLINK_CMD_REGION_NEW
 -DEVLINK_CMD_REGION_DEL
 -DEVLINK_CMD_REGION_READ

ixgbe devlink region implementation, similarly to the ice one,
lets user to create snapshots of content of Non Volatile Memory,
content of Shadow RAM, and capabilities of the device.

For both NVM and SRAM regions provide .read() handler to let user
read their contents without the need to create full snapshots.

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>
Co-developed-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Tested-by: Bharath R <bharath.r@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>