mediatek: bpi-r4: add rootwait to bootargs

In commit cd4de3251c1f ("mediatek: wait for fitblk rootfs"), the linux
6.6 files and patches has been forgotton to be fixed.

Fixes: cd4de3251c1f ("mediatek: wait for fitblk rootfs")
Signed-off-by: Martin Schiller <[email protected]>

target/linux/mediatek/files-6.6/arch/arm64/boot/dts/mediatek/mt7988a-bananapi-bpi-r4.dtsi

@@ -28,7 +28,7 @@
 
 	chosen {
 		stdout-path = &uart0;
-		bootargs = "console=ttyS0,115200n1 loglevel=8 pci=pcie_bus_perf ubi.block=0,fit root=/dev/fit0";
+		bootargs = "console=ttyS0,115200n1 loglevel=8 pci=pcie_bus_perf ubi.block=0,fit root=/dev/fit0 rootwait";
 		rootdisk-spim-nand = <&ubi_rootfs>;
 	};