h8300: Add KGDB support.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 3084e58..cd1f754 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -20,6 +20,7 @@
 	select H8300_TMR8
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZO
+	select HAVE_ARCH_KGDB
 
 config RWSEM_GENERIC_SPINLOCK
 	def_bool y