firmware: Enable stateless firmware loading

Prefer the order of specific version before generic and /etc before
/lib to enable the user to give specific overrides for generic
firmware and distribution firmware.

drivers/base/firmware_loader/main.c

@@ -407,6 +407,8 @@ static int fw_decompress_xz(struct device *dev, struct fw_priv *fw_priv,
 static char fw_path_para[256];
 static const char * const fw_path[] = {
 	fw_path_para,
+	"/etc/firmware/" UTS_RELEASE,
+	"/etc/firmware",
 	"/lib/firmware/updates/" UTS_RELEASE,
 	"/lib/firmware/updates",
 	"/lib/firmware/" UTS_RELEASE,