EmulatorPkg: Add allowable dependency

BZ:
https://bugzilla.tianocore.org/show_bug.cgi?id=3102

Add RedfishPkg to DependencyCheck section in
yaml file.

Signed-off-by: Abner Chang <abner.chang@hpe.com>

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Andrew Fish <afish@apple.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Nickle Wang <nickle.wang@hpe.com>
Cc: Peter O'Hanley <peter.ohanley@hpe.com>
Acked-by: Ray Ni <ray.ni@intel.com>

EmulatorPkg/EmulatorPkg.ci.yaml

@@ -47,6 +47,7 @@
             "MdeModulePkg/MdeModulePkg.dec",
             "EmulatorPkg/EmulatorPkg.dec",
             "NetworkPkg/NetworkPkg.dec",
+            "RedfishPkg/RedfishPkg.dec",
             "EmbeddedPkg/EmbeddedPkg.dec", ## is this one OK??
         ],
         # For host based unit tests