LCD: Add an option to skip registration as an stdio output

This patch adds an option to skip the registration of LCD stdio output for
boards that want to show different text on LCD than on serial output (or
the active stdout selected by the environment variable).

Signed-off-by: Stephane Ayotte <sayotte@tycoint.com>

common/lcd.c

@@ -143,6 +143,16 @@ __weak int lcd_get_size(int *line_length)
 	return *line_length * panel_info.vl_row;
 }
 
+/*
+ * Implement a weak default function for boards that optionally
+ * need to skip the lcd console initialization.
+ */
+__weak int board_lcd_console_skip(void)
+{
+	/* As default, don't skip cfb init */
+	return 0;
+}
+
 int drv_lcd_init(void)
 {
 	struct stdio_dev lcddev;
@@ -152,6 +162,9 @@ int drv_lcd_init(void)
 
 	lcd_init(lcd_base);
 
+	if (board_lcd_console_skip())
+		return 0;
+
 	/* Device initialization */
 	memset(&lcddev, 0, sizeof(lcddev));