nv: Allow full variable name in nvvar_add

As a convenience for users allow to pass the full name, including
the leading "nv.", to nvvar_add().

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

common/globalvar.c

@@ -240,6 +240,9 @@ int nvvar_add(const char *name, const char *value)
 {
 	int ret;
 
+	if (!strncmp(name, "nv.", 3))
+		name += 3;
+
 	ret = __nvvar_add(name, value);
 	if (ret)
 		return ret;