scripts: extract_dts_inlcudes: generate cells for gpio

Apply extract_cells function also when property name
contains "gpio" (could be cs-gpio, rst-gpio, gpio-irq, ..)

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
diff --git a/scripts/dts/extract_dts_includes.py b/scripts/dts/extract_dts_includes.py
index 7592883..6da8bfc 100755
--- a/scripts/dts/extract_dts_includes.py
+++ b/scripts/dts/extract_dts_includes.py
@@ -422,7 +422,7 @@
         extract_pinctrl(node_address, yaml,
                         reduced[node_address]['props'][y_key],
                         names[p_index], p_index, defs, def_label)
-    elif 'clocks' in y_key:
+    elif 'clocks' in y_key or 'gpios' in y_key:
         extract_cells(node_address, yaml, y_key,
                       names, 0, prefix, defs, def_label)
     else: