RedfishPkg/RedfishDiscoverDxe: Install protocol on each network interface

RedfishPkg/RedfishDiscoverDxe: Install protocol on each network interface

BZ 4037:
Install EFI_DISCOVER_PROTOCOL on each network interface.

This fixes the issue that causes the high-level Redfish driver
on the network interface is stopped when:
1. EFI_DISCOVER_PROTOCOL is reinstalled on a new-found network
   interface, or
2. EFI_DISCOVER_PROTOCOL is stopped on the network interface
   other than the one which is used to communicate with Redfish
   service.

Cc: Nickle Wang <nickle@csie.io>
Cc: Igor Kulchytskyy <igork@ami.com>
Signed-off-by: Abner Chang <abner.chang@amd.com>
Reviewed-by: Nickle Wang <nickle@csie.io>
Reviewed-by: Igor Kulchytskyy <igork@ami.com>