oniro-linux-blueprint-vending-machine.conf: Clean boot logs on screen

* Disable kernel logs on tty0
* Disable boot cursor
* Disable EFI logs
* Set bootloader timeout to 0 for silent bootloader
* Remove the Raspberry Pi rainbow screen

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-blueprints/conf/distro/oniro-linux-blueprint-vending-machine.conf

@@ -41,3 +41,9 @@ WAVESHARE_1024X600_C_2_1 = "1"
 
 # Mask getty on tty1 to cleanup boot process
 SYSTEMD_MASK_GETTY = "tty1"
+
+# Cleanup screen
+APPEND_remove = "console=tty0"
+APPEND_append = " vt.global_cursor_default=0 quiet"
+DISABLE_SPLASH_rpi = "1"
+WIC_BOOOTLOADER_TIMEOUT = "0"