score: select generic atomic64_t support

It's required for the core fs/namespace.c and many other basic features.
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Acked-by: Lennox Wu <lennox.wu@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/score/Kconfig

@@ -5,6 +5,7 @@ config SCORE
        select HAVE_GENERIC_HARDIRQS
        select GENERIC_IRQ_SHOW
        select GENERIC_IOMAP
+       select GENERIC_ATOMIC64
        select HAVE_MEMBLOCK
        select HAVE_MEMBLOCK_NODE_MAP
        select ARCH_DISCARD_MEMBLOCK