ath79: fix sysupgrade TP-Link WR841v9

Remove SUPPORTED_DEVICES from wr841-v9 because it´s not needed and
for consistency rename everything to tl-wr841-v9.

Signed-off-by: Johann Neuhauser <johann@it-neuhauser.de>

target/linux/ath79/dts/qca9533_tplink_tl-wr841-v9.dts

@@ -7,6 +7,6 @@
 #include "qca9533_tplink_tl-wr841.dtsi"
 
 / {
-	compatible = "tplink,tl-wr841n-v9", "qca,qca9533";
+	compatible = "tplink,tl-wr841-v9", "qca,qca9533";
 	model = "TP-Link TL-WR841N/ND Version 9";
 };

target/linux/ath79/image/tiny-tp-link.mk

@@ -123,7 +123,6 @@ define Device/tplink_tl-wr841-v9
   ATH_SOC := qca9533
   DEVICE_TITLE := TP-LINK TL-WR841N/ND v9
   TPLINK_HWID := 0x08410009
-  SUPPORTED_DEVICES += tl-wr841n-v9
 endef
 TARGET_DEVICES += tplink_tl-wr841-v9