nios2: convert altera_uart to driver model

Convert altera_uart to driver model.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/include/configs/nios2-generic.h b/include/configs/nios2-generic.h
index e0ee047..c330c0a 100644
--- a/include/configs/nios2-generic.h
+++ b/include/configs/nios2-generic.h
@@ -23,14 +23,7 @@
 /*
  * SERIAL
  */
-#if defined(CONFIG_ALTERA_JTAG_UART)
-#else
-# define CONFIG_SYS_NIOS_CONSOLE	CONFIG_SYS_UART_BASE
-#endif
-
-#define CONFIG_SYS_NIOS_FIXEDBAUD
-#define CONFIG_BAUDRATE		CONFIG_SYS_UART_BAUD
-#define CONFIG_SYS_BAUDRATE_TABLE	{CONFIG_BAUDRATE}
+#define CONFIG_BAUDRATE			115200
 #define CONFIG_SYS_CONSOLE_INFO_QUIET	/* Suppress console info */
 
 /*