fdt: Rename a few functions in fdt_support

These two functions have an of_ prefix which conflicts with naming used
in of_addr. Rename them:

   fdt_read_number
   fdt_support_bus_default_count_cells

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index d440f5c..048a517 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -2448,7 +2448,7 @@
 	int len, idx;
 
 	parent = fdt_parent_offset(blob, node);
-	of_bus_default_count_cells(blob, parent, &addrc, &sizec);
+	fdt_support_default_count_cells(blob, parent, &addrc, &sizec);
 	/* decode regs, there may be multiple reg tuples. */
 	cell = fdt_getprop(blob, node, "reg", &len);
 	if (!cell)