init: stop console service on userdebug/eng to reduce UART noise

The AOSP init.rc starts the console service (interactive shell on
/dev/ttyAMA0) when ro.debuggable=1. Kernel messages written to the
UART are read by the shell as input, causing continuous '>' secondary
prompts. ADB over TCP (port 5555) is the preferred debug shell; the
console service is not needed.

ramdisk/init.rpi5.rc

@@ -13,5 +13,8 @@ on fs
 on late-fs
     mount_all /vendor/etc/fstab.${ro.hardware}  --late
 
+on property:ro.debuggable=1
+    stop console
+
 on property:sys.boot_completed=1
     swapon_all /vendor/etc/fstab.zram.${persist.vendor.zram.size}