h8300: add missing L1_CACHE_SHIFT

Fix the build error

  lib/atomic64.c: In function 'lock_addr':
  lib/atomic64.c:40:11: error: 'L1_CACHE_SHIFT' undeclared (first use in this function)
  lib/atomic64.c:40:11: note: each undeclared identifier is reported only once for each function it appears in

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>