fdt_support: fix comments syntax error

Fix comments syntax error in fdt_node_offset_by_compat_reg()
description:
    compatiable -> compatible

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/common/fdt_support.c b/common/fdt_support.c
index dbceec6..2053fe3 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -1486,11 +1486,11 @@
 }
 
 /**
- * fdt_node_offset_by_compat_reg: Find a node that matches compatiable and
+ * fdt_node_offset_by_compat_reg: Find a node that matches compatible and
  * who's reg property matches a physical cpu address
  *
  * @blob: ptr to device tree
- * @compat: compatiable string to match
+ * @compat: compatible string to match
  * @compat_off: property name
  *
  */