lcd: Implement lcd_printf()
lcd_printf() has a prototype in include/lcd.h but no implementation. Fix this by borrowing the lcd_printf() implementation from the cogent board code (which appears to use its own LCD framework.) Signed-off-by: NHaavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by: NAnatolij Gustschin <agust@denx.de>
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