[Patch] BaseTools: Fix the bug to support generate FFS by Align=Auto

[Yonghong Zhu <yonghong.zhu@intel.com>]

FDF spec support to use 'Auto' as <FfsAlignmentValues>, but current Tool
report error about -a=Auto is invalid option when we set Align=Auto for
RAW File.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
---
 BaseTools/Source/Python/GenFds/FdfParser.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/BaseTools/Source/Python/GenFds/FdfParser.py b/BaseTools/Source/Python/GenFds/FdfParser.py
index 5489df5..f17a41f 100644
--- a/BaseTools/Source/Python/GenFds/FdfParser.py
+++ b/BaseTools/Source/Python/GenFds/FdfParser.py
@@ -2744,11 +2744,13 @@ class FdfParser:
         while True:
             AlignValue = None
             if self.__GetAlignment():
                 if self.__Token not in ("Auto", "8", "16", "32", "64", "128", "512", "1K", "4K", "32K" ,"64K"):
                     raise Warning("Incorrect alignment '%s'" % self.__Token, self.FileName, self.CurrentLineNumber)
-                AlignValue = self.__Token
+                #For FFS, Auto is default option same to ""
+                if not self.__Token == "Auto":
+                    AlignValue = self.__Token
             if not self.__GetNextToken():
                 raise Warning("expected Filename value", self.FileName, self.CurrentLineNumber)
 
             FileName = self.__Token.replace('$(SPACE)', ' ')
             if FileName == '}':
-- 
2.6.1.windows.1