ipq40xx: improve support for Edgecore ECW5211

This adds several stylistic and functional improvements of the recently
added Edgecore ECW5211, especially:

* Drop the local BDFs as those are already in the upstream under different names
* Add SPDX tag to DTS
* Add label MAC address
* Move LED trigger to DTS
* Remove unnecessary status="okay"
* Disable unused SS USB phy as the USB port only supports USB 2.0
* Make uboot-env partition writable
* Remove qcom,poll_required_dynamic property as the driver does not use it
* Tidy up the device recipe

Fixes: 4488b260a0 ("ipq40xx: add Edgecore ECW5211 support")
Signed-off-by: Sungbo Eo <mans0n@gorani.run>
Acked-by: Robert Marko <robert.marko@sartura.hr>

package/firmware/ipq-wifi/Makefile

@@ -31,7 +31,6 @@ ALLWIFIBOARDS:= \
 	buffalo_wtr-m2133hp \
 	cellc_rtl30vw \
 	dlink_dap2610 \
-	edgecore_ecw5211 \
 	edgecore_ecw5410 \
 	edgecore_oap100 \
 	engenius_eap2200 \
@@ -110,7 +109,6 @@ $(eval $(call generate-ipq-wifi-package,avm_fritzrepeater-1200,AVM FRITZRepeater
 $(eval $(call generate-ipq-wifi-package,buffalo_wtr-m2133hp,Buffalo WTR-M2133HP))
 $(eval $(call generate-ipq-wifi-package,cellc_rtl30vw, Cell C RTL30VW))
 $(eval $(call generate-ipq-wifi-package,dlink_dap2610,D-Link DAP-2610))
-$(eval $(call generate-ipq-wifi-package,edgecore_ecw5211,Edgecore ECW5211))
 $(eval $(call generate-ipq-wifi-package,edgecore_ecw5410,Edgecore ECW5410))
 $(eval $(call generate-ipq-wifi-package,edgecore_oap100,Edgecore OAP100))
 $(eval $(call generate-ipq-wifi-package,engenius_eap2200,EnGenius EAP2200))