powerpc: remove support for kmtergr1 and MPC8309

The kmtegr1 board is out of maintenance and can be removed. As it is the
only board in the tree using MPC8309 the support for this CPU is dropped
completely.

Signed-off-by: Holger Brunck <holger.brunck@hitachienergy.com>
diff --git a/arch/powerpc/include/asm/arch-mpc83xx/gpio.h b/arch/powerpc/include/asm/arch-mpc83xx/gpio.h
index b740675..19c2506 100644
--- a/arch/powerpc/include/asm/arch-mpc83xx/gpio.h
+++ b/arch/powerpc/include/asm/arch-mpc83xx/gpio.h
@@ -8,8 +8,7 @@
  */
 #if defined(CONFIG_ARCH_MPC8313) || defined(CONFIG_ARCH_MPC8308)
 #define MPC83XX_GPIO_CTRLRS 1
-#elif defined(CONFIG_ARCH_MPC834X) || defined(CONFIG_ARCH_MPC837X) || \
-	defined(CONFIG_ARCH_MPC8309)
+#elif defined(CONFIG_ARCH_MPC834X) || defined(CONFIG_ARCH_MPC837X)
 #define MPC83XX_GPIO_CTRLRS 2
 #else
 #define MPC83XX_GPIO_CTRLRS 0