[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.

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/GenFdsGlobalVariable.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py b/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
index c3f3624..05c4070 100644
--- a/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
+++ b/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
@@ -432,10 +432,12 @@ class GenFdsGlobalVariable:
         if Fixed == True:
             Cmd += ["-x"]
         if CheckSum:
             Cmd += ["-s"]
         if Align not in [None, '']:
+            if Align == 'Auto':
+                Align = '1'
             Cmd += ["-a", Align]
 
         Cmd += ["-o", Output]
         for I in range(0, len(Input)):
             Cmd += ("-i", Input[I])
-- 
2.6.1.windows.1