mn10300: objcopy flags fix

The gcc-4.2.1 based toolchain for MN10300 adds some new note sections
which need to be stripped from the binary image.  This patch takes care of
that.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>