fdt: Export fdtdec_lookup() and fix the name

The name of this function is not consistent, so fix it, and export
the function for external use.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/fdtdec.h

@@ -109,6 +109,19 @@ struct fdt_gpio_state {
 int fdtdec_next_alias(const void *blob, const char *name,
 		enum fdt_compat_id id, int *upto);
 
+/**
+ * Find the compatible ID for a given node.
+ *
+ * Generally each node has at least one compatible string attached to it.
+ * This function looks through our list of known compatible strings and
+ * returns the corresponding ID which matches the compatible string.
+ *
+ * @param blob		FDT blob to use
+ * @param node		Node containing compatible string to find
+ * @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match
+ */
+enum fdt_compat_id fdtdec_lookup(const void *blob, int node);
+
 /**
  * Find the next compatible node for a peripheral.
  *

lib/fdtdec.c

@@ -128,7 +128,7 @@ int fdtdec_get_is_enabled(const void *blob, int node)
 	return 1;
 }
 
-enum fdt_compat_id fd_dec_lookup(const void *blob, int node)
+enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
 {
 	enum fdt_compat_id id;