libfdt: Make fdtdec_get_child_count() available for HOST

The tool need to use fdtdec_get_child_count(), make it available for
HOST_CC.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/fdt_support.h b/include/fdt_support.h
index ba14acd..2eff311 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -343,6 +343,15 @@
 #ifdef USE_HOSTCC
 int fdtdec_get_int(const void *blob, int node, const char *prop_name,
 		int default_val);
+
+/*
+ * Count child nodes of one parent node.
+ *
+ * @param blob	FDT blob
+ * @param node	parent node
+ * @return number of child node; 0 if there is not child node
+ */
+int fdtdec_get_child_count(const void *blob, int node);
 #endif
 #ifdef CONFIG_FMAN_ENET
 int fdt_update_ethernet_dt(void *blob);