CHROMIUM: finit_module: add syscall to ARM

CHROMIUM: finit_module: add syscall to ARM

Add finit_module syscall to the ARM syscall list.

BUG=chromium-os:34134
TEST=snow build, manual testing

[accepted into Rusty's modules-wip tree for linux-next:
 http://git.kernel.org/?p=linux/kernel/git/rusty/linux.git;a=shortlog;h=refs/heads/modules-wip]
Change-Id: I7d35fd0cc98ff29e2a8dfae166d704d348908a2a
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/34305
Reviewed-by: Olof Johansson <olofj@chromium.org>