h8300: add support for TIF_NOTIFY_SIGNAL

[ Upstream commit 2f9799ad ]

Wire up TIF_NOTIFY_SIGNAL handling for h8300.

Cc: uclinux-h8-devel@lists.sourceforge.jp
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>