arm: mvebu: turris_omnia: support higher baudrates

Add support for higher baudrates than 115200. This is useful when
debugging.
Signed-off-by: Marek Behún <marek.behun@nic.cz>

include/configs/turris_omnia.h

@@ -8,8 +8,10 @@
 #define _CONFIG_TURRIS_OMNIA_H
 
 /*
- * High Level Configuration Options (easy to change)
+ * Support higher baudrates (useful for debugging)
  */
+#define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, \
+					  115200, 230400, 460800, 921600 }
 
 /*
  * More memory available for boot images