BaseTools: Make brotli a submodule

Use submodule way to access brotli in BaseTools based on
brotli version 666c3280cc11dc433c303d79a83d4ffbdd12cc8d.
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2558

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

.pytool/CISettings.py

@@ -148,6 +148,8 @@ class Settings(CiBuildSettingsManager, UpdateSettingsManager, SetupSettingsManag
             "MdeModulePkg/Universal/RegularExpressionDxe/oniguruma", False))
         rs.append(RequiredSubmodule(
             "MdeModulePkg/Library/BrotliCustomDecompressLib/brotli", False))
+        rs.append(RequiredSubmodule(
+            "BaseTools/Source/C/BrotliCompress/brotli", False))
         return rs
 
     def GetName(self):