serial: sh-sci: Drop the sci_fck clock fallback

All platforms that used to define an sci_fck clock have now switched to
the fck name. Remove the fallback code.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/sh-sci.c

@@ -2481,11 +2481,6 @@ static int sci_init_clocks(struct sci_port *sci_port, struct device *dev)
 			if (!IS_ERR(clk))
 				goto found;
 
-			/* SH has historically named the clock "sci_fck". */
-			clk = devm_clk_get(dev, "sci_fck");
-			if (!IS_ERR(clk))
-				goto found;
-
 			/*
 			 * Not all SH platforms declare a clock lookup entry
 			 * for SCI devices, in which case we need to get the