OvmfPkg: Disable EccCheck CI until EccCheck issues are fixed

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Message-Id: <20201210215640.1260-1-mikuback@linux.microsoft.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

OvmfPkg/OvmfPkg.ci.yaml

@@ -22,7 +22,8 @@
         ],
         ## Both file path and directory path are accepted.
         "IgnoreFiles": [
-        ]
+        ],
+        "skip": True
     },
     ## options defined .pytool/Plugin/CompilerPlugin
     "CompilerPlugin": {