vmlinux.lds.h initcall update breaks ABI prefixed arches

["Mike Frysinger" <vapier.adi@gmail.com>]

commits ac9103dd8e4dc65c110d6cba9a3380c6c617ffa7 and
660625fb93f2fc0e633da9cb71d13d895b385f64 break any arch that has an
ABI prefix (like Blackfin).  when declaring symbols in vmlinux.lds.h,
you must wrap them in VMLINUX_SYMBOL(), else you break a couple of
arches.

in this case, the async/device initcall start/end results in:
init/built-in.o: In function `do_async_initcalls':
init/main.c:(.init.text+0x158): undefined reference to `__async_initcall_end'
init/main.c:(.init.text+0x15c): undefined reference to `__async_initcall_start'
init/main.c:(.init.text+0x160): undefined reference to `__async_initcall_end'
init/main.c:(.init.text+0x164): undefined reference to `__async_initcall_start'
init/built-in.o: In function `do_initcalls':
init/main.c:(.init.text+0x2cc): undefined reference to `__async_initcall_start'
init/main.c:(.init.text+0x2d0): undefined reference to `__async_initcall_start'
init/main.c:(.init.text+0x2f4): undefined reference to `__device_initcall_end'
init/main.c:(.init.text+0x2f8): undefined reference to `__device_initcall_end'
init/main.c:(.init.text+0x30a): undefined reference to `__async_initcall_end'
init/main.c:(.init.text+0x30e): undefined reference to `__async_initcall_end'
make: *** [.tmp_vmlinux1] Error 1
-mike