BaseTools:ECC need to handle lower case 'static'

BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=1778

We are going to add keyword (lower case) 'static' for functions and global
variables which are not referenced outside their current C file.

However, the ECC tool only recognizes upper case 'STATIC' at this moment.
This will lead to issue reports for new codes that follow the above coding
style.

This patch is going to handle lower case 'static'

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

BaseTools/Source/Python/Ecc/Configuration.py

@@ -256,7 +256,7 @@ class Configuration(object):
         ## Declarations and Data Types Checking
         self.DeclarationDataTypeCheckAll = 0
 
-        # Check whether no use of int, unsigned, char, void, static, long in any .c, .h or .asl files.
+        # Check whether no use of int, unsigned, char, void, long in any .c, .h or .asl files.
         self.DeclarationDataTypeCheckNoUseCType = 1
         # Check whether the modifiers IN, OUT, OPTIONAL, and UNALIGNED are used only to qualify arguments to a function and should not appear in a data type declaration
         self.DeclarationDataTypeCheckInOutModifier = 1