arm: dts: MediaTek: remove tick-timer from mt7629.dtsi

This patch removes tick-timer as all mt7629 boards should use arch timer.

diff --git a/arch/arm/dts/mt7629-rfb.dts b/arch/arm/dts/mt7629-rfb.dts
index 4612218..08c3b59 100644
--- a/arch/arm/dts/mt7629-rfb.dts
+++ b/arch/arm/dts/mt7629-rfb.dts
@@ -18,7 +18,6 @@
 
 	chosen {
 		stdout-path = &uart0;
-		tick-timer = &timer0;
 	};
 };