common: Move lcd_setmem() to lcd.h

This function relates to lcd.h and is about to become obsolete with the
driver-model conversion. Move it out of common.h

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/lcd.h b/include/lcd.h
index cb6b6a4..9a4c0da 100644
--- a/include/lcd.h
+++ b/include/lcd.h
@@ -30,6 +30,7 @@
 void lcd_ctrl_init(void *lcdbase);
 void lcd_enable(void);
 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue);
+ulong lcd_setmem(ulong addr);
 
 /**
  * Set whether we need to flush the dcache when changing the LCD image. This