ath79: NanoBeam M5 fix target_devices

Update the name of for the Ubiquiti NanoBeam M5 to match the
auto-generated one at runtime. Otherwise sysupgrade complains about
mismatching device names.

This also required renaming the DTS.

Signed-off-by: Jan-Niklas Burfeind <[email protected]>

target/linux/ath79/image/generic-ubnt.mk

@@ -255,13 +255,13 @@ define Device/ubnt_nanobeam-ac-xc
 endef
 TARGET_DEVICES += ubnt_nanobeam-ac-xc
 
-define Device/ubnt_nanobeam-m5
+define Device/ubnt_nanobeam-m5-xw
   $(Device/ubnt-xw)
   DEVICE_MODEL := NanoBeam M5
   DEVICE_PACKAGES += rssileds
   SUPPORTED_DEVICES += loco-m-xw
 endef
-TARGET_DEVICES += ubnt_nanobeam-m5
+TARGET_DEVICES += ubnt_nanobeam-m5-xw
 
 define Device/ubnt_nanobridge-m
   $(Device/ubnt-xm)