tools: Compile kwboot for Marvell Armada XP as those SoCs are now supported

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Luka Perkov <luka@openwrt.org>
diff --git a/tools/Makefile b/tools/Makefile
index 2b05b20..3b95964 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -140,6 +140,7 @@
 HOSTCFLAGS_ubsha1.o := -pedantic
 
 hostprogs-$(CONFIG_KIRKWOOD) += kwboot
+hostprogs-$(CONFIG_ARMADA_XP) += kwboot
 hostprogs-y += proftool
 hostprogs-$(CONFIG_STATIC_RELA) += relocate-rela