[RPI][CONSOLE][UART] direct console to serial port only

By default, U-boot sends the console output to both uart and video.
This commit suppresses the video output (where the boot logo is displayed)

recipes-bsp/u-boot/files/0002-RPI-CONSOLE-UART-output-to-UART-only.patch

+From 67ff86d9b564e3da47a53438c057a54c412e9d4f Mon Sep 17 00:00:00 2001
+From: Alessandro Pecugi <alessandro.pecugi@seco.com>
+Date: Thu, 5 Oct 2023 11:17:38 +0000
+Subject: [PATCH 2/2] [RPI][CONSOLE][UART] output to UART only
+
+direct all console messages to the serial port of the raspberryPi (GPIOs 14 and 15) to prevent them from covering the logo
+---
+ include/configs/rpi.h | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/include/configs/rpi.h b/include/configs/rpi.h
+index 50d6bda3f4..4e220a1eae 100644
+--- a/include/configs/rpi.h
++++ b/include/configs/rpi.h
+@@ -72,9 +72,9 @@
+ 
+ /* Environment */
+ #define ENV_DEVICE_SETTINGS \
+-	"stdin=serial,usbkbd\0" \
+-	"stdout=serial,vidconsole\0" \
+-	"stderr=serial,vidconsole\0"
++	"stdin=serial\0" \
++	"stdout=serial\0" \
++	"stderr=serial\0"
+ 
+ #ifdef CONFIG_ARM64
+ #define FDT_HIGH "ffffffffffffffff"
+-- 
+2.25.1
+

recipes-bsp/u-boot/u-boot_2022.01.bbappend

 FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
 SRC_URI += "\
     file://0001-RPI-SPLASH-enable-splash-and-splashsource.patch \
+    file://0002-RPI-CONSOLE-UART-output-to-UART-only.patch \
 "
\ No newline at end of file