board/km: remove obsolete ARCH_KIRKWOOD

We already removed the support for these boards.

Signed-off-by: Holger Brunck <holger.brunck@hitachienergy.com>
diff --git a/board/keymile/Kconfig b/board/keymile/Kconfig
index 46d0897..cd8a06e 100644
--- a/board/keymile/Kconfig
+++ b/board/keymile/Kconfig
@@ -34,7 +34,6 @@
 
 config KM_RESERVED_PRAM
 	hex "Reserved RAM"
-	default 0x801000 if ARCH_KIRKWOOD
 	default 0x0 if MPC83xx
 	default 0x1000 if MPC85xx || ARCH_LS1021A
 	depends on !ARCH_SOCFPGA
@@ -79,7 +78,7 @@
 
 config KM_COMMON_ETH_INIT
 	bool "Common Ethernet Initialization"
-	default y if ARCH_KIRKWOOD || MPC83xx
+	default y if MPC83xx
 	default n if MPC85xx || ARCH_SOCFPGA || ARCH_LS1021A
 	help
 	  Use the Ethernet initialization implemented in common code that
@@ -101,7 +100,7 @@
 config KM_IVM_BUS
 	int "IVM I2C Bus"
 	default 0 if ARCH_SOCFPGA
-	default 1 if ARCH_KIRKWOOD || MPC85xx || ARCH_LS1021A
+	default 1 if MPC85xx || ARCH_LS1021A
 	default 2 if MPC83xx
 	help
 	  Identifier number of I2C bus, where the inventory EEPROM is connected to.