gcc: Clean-up of non-C++0x compliant code, first steps

This patch cleans up a number of minor issues aiming to get closer to
compliance with the C++0x standard as interpreted by gcc and clang
(compile with std=c++0x and -pedantic-errors). In particular, the
patch cleans up enums where the last item was succeded by a comma,
namespaces closed by a curcly brace followed by a semi-colon, and the
use of the GNU-extension typeof (replaced by templated functions). It
does not address variable-length arrays, zero-size arrays, anonymous
structs, range expressions in switch statements, and the use of long
long. The generated CPU code also has a large number of issues that
remain to be fixed, mainly related to overflows in implicit constant
conversion (due to shifts).

src/arch/arm/linux/atag.hh

@@ -51,7 +51,7 @@ enum {
     RevTag    = 0x54410007,
     SerialTag = 0x54410006,
     CmdTag    = 0x54410009,
-    NoneTag   = 0x00000000,
+    NoneTag   = 0x00000000
 };
 
 class AtagHeader