OvmfPkg: Do not check VbeShim.h formatting with Uncrustify

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3875

The following files:
  OvmfPkg/Bhyve/BhyveRfbDxe/VbeShim.h
  OvmfPkg/QemuVideoDxe/VbeShim.h

Are auto generated by the following generators:
  OvmfPkg/Bhyve/BhyveRfbDxe/VbeShim.sh
  OvmfPkg/QemuVideoDxe/VbeShim.sh

Therefore, Uncrustify causes a file update to produce a very large
diff due to formatting changes.

This change does the following:
  1. Reverts the Uncrustify changes applied to the files in commit
     ac0a286f4d.
  2. Uses a new UncrustifyCheck CI plugin configuration option to
     exclude the files from future formatting checks.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Peter Grehan <grehan@freebsd.org>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>

OvmfPkg/OvmfPkg.ci.yaml

@@ -97,5 +97,10 @@
         ],           # words to extend to the dictionary for this package
         "IgnoreStandardPaths": [],   # Standard Plugin defined paths that should be ignore
         "AdditionalIncludePaths": [] # Additional paths to spell check (wildcards supported)
+    },
+
+    # options defined in .pytool/Plugin/UncrustifyCheck
+    "UncrustifyCheck": {
+      "IgnoreFiles": ["VbeShim.h"]
     }
 }