configs: Enable the pre-load signature in tools-only_defconfig

pre-load related config options are enabled to have support of it in host
tools.

'CONFIG_FIT_SIGNATURE=y' is being automatically removed since it is
selected by CONFIG_IMAGE_PRE_LOAD_SIG.

Signed-off-by: Paul HENRYS <paul.henrys_ext@softathome.com>
diff --git a/configs/tools-only_defconfig b/configs/tools-only_defconfig
index cecd261..e64bb76 100644
--- a/configs/tools-only_defconfig
+++ b/configs/tools-only_defconfig
@@ -9,10 +9,11 @@
 CONFIG_ANDROID_BOOT_IMAGE=y
 CONFIG_TIMESTAMP=y
 CONFIG_FIT=y
-CONFIG_FIT_SIGNATURE=y
 CONFIG_BOOTSTD_FULL=n
 CONFIG_BOOTMETH_CROS=n
 CONFIG_BOOTMETH_VBE=n
+CONFIG_IMAGE_PRE_LOAD=y
+CONFIG_IMAGE_PRE_LOAD_SIG=y
 CONFIG_USE_BOOTCOMMAND=y
 CONFIG_BOOTCOMMAND="run distro_bootcmd"
 CONFIG_CMD_BOOTD=n