wifi: rtl8xxxu: Recognise all possible chip cuts

The chip cut, also known as the chip version, is a letter from A (0)
to P (15). Recognise them all instead of printing "unknown" when it's
greater than E.
Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/1559c705-0b0b-8dcb-7596-fbb85844d3d9@gmail.com

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c

@@ -1574,30 +1574,14 @@ rtl8xxxu_set_spec_sifs(struct rtl8xxxu_priv *priv, u16 cck, u16 ofdm)
 static void rtl8xxxu_print_chipinfo(struct rtl8xxxu_priv *priv)
 {
 	struct device *dev = &priv->udev->dev;
-	char *cut;
+	char cut = '?';
 
-	switch (priv->chip_cut) {
-	case 0:
-		cut = "A";
-		break;
-	case 1:
-		cut = "B";
-		break;
-	case 2:
-		cut = "C";
-		break;
-	case 3:
-		cut = "D";
-		break;
-	case 4:
-		cut = "E";
-		break;
-	default:
-		cut = "unknown";
-	}
+	/* Currently always true: chip_cut is 4 bits. */
+	if (priv->chip_cut <= 15)
+		cut = 'A' + priv->chip_cut;
 
 	dev_info(dev,
-		 "RTL%s rev %s (%s) %iT%iR, TX queues %i, WiFi=%i, BT=%i, GPS=%i, HI PA=%i\n",
+		 "RTL%s rev %c (%s) %iT%iR, TX queues %i, WiFi=%i, BT=%i, GPS=%i, HI PA=%i\n",
 		 priv->chip_name, cut, priv->chip_vendor, priv->tx_paths,
 		 priv->rx_paths, priv->ep_tx_count, priv->has_wifi,
 		 priv->has_bluetooth, priv->has_gps, priv->hi_pa);