spi: spi-pxa2xx: Remove CLK_IS_ROOT

This flag is a no-op now (see commit 47b0eeb3dc8a "clk: Deprecate
CLK_IS_ROOT", 2016-02-02) so remove it.

Cc: Daniel Mack <[e-mail]>
Cc: Haojian Zhuang <[e-mail]>
Cc: Robert Jarzmik <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-pxa2xx-pci.c

···
 	ssp->type = c->type;
 
 	snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
-	ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
-					CLK_IS_ROOT, c->max_clk_rate);
+	ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0,
+					   c->max_clk_rate);
 	 if (IS_ERR(ssp->clk))
 		return PTR_ERR(ssp->clk);