regmap: Allow ranges to be named

For more useful diagnostics.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 80f9ab9..27e66c3 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -120,6 +120,7 @@
 
 struct regmap_range_node {
 	struct rb_node node;
+	const char *name;
 
 	unsigned int range_min;
 	unsigned int range_max;