mxs: clock: Use 'mxs' prefix for methods

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c
index 31cd77d..bb865b7 100644
--- a/drivers/spi/mxs_spi.c
+++ b/drivers/spi/mxs_spi.c
@@ -137,7 +137,7 @@
 
 	writel(0, &ssp_regs->hw_ssp_cmd0);
 
-	mx28_set_ssp_busclock(slave->bus, mxs_slave->max_khz);
+	mxs_set_ssp_busclock(slave->bus, mxs_slave->max_khz);
 
 	return 0;
 }