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/include/fdt_support.h b/include/fdt_support.h
index 6fea5c7..5ef78cc 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -248,7 +248,7 @@
 }
 
 /* Helper to read a big number; size is in cells (not bytes) */
-static inline u64 of_read_number(const fdt32_t *cell, int size)
+static inline u64 fdt_read_number(const fdt32_t *cell, int size)
 {
 	u64 r = 0;
 	while (size--)
@@ -256,7 +256,7 @@
 	return r;
 }
 
-void of_bus_default_count_cells(const void *blob, int parentoffset,
+void fdt_support_default_count_cells(const void *blob, int parentoffset,
 					int *addrc, int *sizec);
 int ft_verify_fdt(void *fdt);
 int arch_fixup_memory_node(void *blob);