Prepare `kwboot` for the initial system installation

Previously we would rely on a side build of uboot-tools, which is silly.
Also, it's nice if the HW vendors can use one existing board to
bootstrap others, so build this both for the host system as well as for
the target.

Change-Id: I9334bec25cdb6bc392b3c112d9fa689fa203bd7d
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 9f9563f..9a2f461 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -49,6 +49,7 @@
 BR2_PACKAGE_PICOCOM=y
 BR2_PACKAGE_PMBUS_PEEK=y
 BR2_PACKAGE_SPI_TOOLS=y
+BR2_PACKAGE_UBOOT_TOOLS_KWBOOT=y
 BR2_PACKAGE_CA_CERTIFICATES=y
 BR2_PACKAGE_LIBGPIOD_TOOLS=y
 BR2_PACKAGE_MSTPD=y
@@ -99,6 +100,7 @@
 BR2_PACKAGE_HOST_MTOOLS=y
 BR2_PACKAGE_HOST_UBOOT_TOOLS_BOOT_SCRIPT=y
 BR2_PACKAGE_HOST_UBOOT_TOOLS_BOOT_SCRIPT_SOURCE="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/boot.scr.txt"
+BR2_PACKAGE_HOST_UBOOT_TOOLS_KWBOOT=y
 BR2_PACKAGE_CLA_SYSREPO=y
 CZECHLIGHT_CFG_FS_SIZE="256M"
 CZECHLIGHT_CFG_FS_PERSIST_SYSREPO=y