ath79: fix firmware partition attributes for GL-AR300M16 and -Lite

During the introduction of the ath79/nand images for the GL-AR300M
series the firmware partition label and compatible were altered,
but the necessary adjustments have not been made for the
GL-AR300M16 and the GL-AR300M-Lite. This will result in a
non-bootable partition setup for these devices.

This patch adds the necessary definitions to those two devices.

Fixes: 55e6c903ae ("ath79: GL-AR300M: provide NAND support;
       increase to 4 MB kernel")
Fixes: b591cabd39 ("ath79: add GL.iNet GL-AR300M16 as NOR-only
       board")

Signed-off-by: Jeff Kletsky <git-commits@allycomm.com>
[extend commit message, alter commit title]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ath79/dts/qca9531_glinet_gl-ar300m-lite.dts

@@ -11,6 +11,11 @@
 
 /delete-node/ &nand_flash;
 
+&nor_firmware {
+	compatible = "denx,uimage";
+	label = "firmware";
+};
+
 // "Disable" unpopulated GMAC1
 
 &eth1 {

target/linux/ath79/dts/qca9531_glinet_gl-ar300m16.dts

@@ -10,3 +10,8 @@
 };
 
 /delete-node/ &nand_flash;
+
+&nor_firmware {
+	compatible = "denx,uimage";
+	label = "firmware";
+};