lantiq: falcon: remove bootargs-append

This attribute is not evaluated any more and the boot loader on these
reference boards does not provide a broken root= or console= parameter.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/lantiq/dts/FALCON-SFP.dts

@@ -7,10 +7,6 @@
 	model = "FALCON-SFP - Lantiq Falcon SFP Stick";
 	compatible = "lantiq,falcon-sfp", "lantiq,falcon";
 
-	chosen {
-		bootargs-append = "console=ttyLTQ0,115200 init=/etc/preinit";
-	};
-
 	aliases {
 		spi0 = &ebu_cs0;
 	};