BaseTools: Fixed the mis-using strip() function issue.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2003

lstrip(parameter) do the match based on the char
in parameter but not only the whole parameter string.

In GenMake line 1082,
CmdSign.lstrip('/Fo') will strip the '/' or
'F' or 'o' on the left of CmdSign. This is not expected.

This patch is going to fix such issue.

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

BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py

@@ -793,7 +793,10 @@ class GenFdsGlobalVariable:
     def GetPcdValue (PcdPattern):
         if PcdPattern is None:
             return None
-        PcdPair = PcdPattern.lstrip('PCD(').rstrip(')').strip().split('.')
+        if PcdPattern.startswith('PCD('):
+            PcdPair = PcdPattern[4:].rstrip(')').strip().split('.')
+        else:
+            PcdPair = PcdPattern.strip().split('.')
         TokenSpace = PcdPair[0]
         TokenCName = PcdPair[1]