ArmVirtPkg: Update YAML to ignore specific ECC files/errors

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3749

Update package YAML files to ignore ECC errors that are
already present.  These issues must be fixed in the future,
but should not block source code changes for these known
issues.

Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>

ArmVirtPkg/ArmVirtPkg.ci.yaml

@@ -24,6 +24,7 @@
         ],
         ## Both file path and directory path are accepted.
         "IgnoreFiles": [
+            "Library/PlatformBootManagerLib/PlatformBm.c"
         ]
     },
     ## options defined .pytool/Plugin/CompilerPlugin