[MIPS] TXx9: Unify serial_txx9 setup

* Unify calling of early_serial_txx9_setup.
* Use dedicated serial clock on RBTX4938.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/txx9/jmr3927/setup.c b/arch/mips/txx9/jmr3927/setup.c
index cf7513d..87db41b 100644
--- a/arch/mips/txx9/jmr3927/setup.c
+++ b/arch/mips/txx9/jmr3927/setup.c
@@ -105,7 +105,7 @@
 	/* initialize board */
 	jmr3927_board_init();
 
-	tx3927_setup_serial(1 << 1); /* ch1: noCTS */
+	tx3927_sio_init(0, 1 << 1); /* ch1: noCTS */
 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
 	argptr = prom_getcmdline();
 	if (!strstr(argptr, "console="))