km_kirkwood: enable MV88E6352_SWITCH support for kmnusa

This is required to configure the external 88e6352 switch on nusa.

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Holger Brunck <holger.brunck@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>
Acked-by: Prafulla Wadaskar <Prafulla@marvell.com>

include/configs/km_kirkwood.h

@@ -62,6 +62,8 @@
 #define CONFIG_KM_ENV_IS_IN_SPI_NOR
 #define CONFIG_KM_FPGA_CONFIG
 #define CONFIG_KM_PIGGY4_88E6352
+#define CONFIG_MV88E6352_SWITCH
+#define CONFIG_KM_MVEXTSW_ADDR		0x10
 
 /* KM_MGCOGE3UN */
 #elif defined(CONFIG_KM_MGCOGE3UN)