BaseTools: Support PCD flexible values format

https://bugzilla.tianocore.org/show_bug.cgi?id=541

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/AutoGen/GenC.py

@@ -1033,6 +1033,8 @@ def CreateModulePcdCode(Info, AutoGenC, AutoGenH, Pcd):
 
         if Pcd.DatumType in ['UINT64', 'UINT32', 'UINT16', 'UINT8']:
             try:
+                if Value.upper().endswith('L'):
+                    Value = Value[:-1]
                 if Value.upper().startswith('0X'):
                     ValueNumber = int (Value, 16)
                 else: