tbs2910: add PRE_CONSOLE_BUFFER support

Add PRE_CONSOLE_BUFFER support to display early boot messages over HDMI.

Signed-off-by: Soeren Moch <smoch@web.de>
diff --git a/include/configs/tbs2910.h b/include/configs/tbs2910.h
index eec0241..42e5821 100644
--- a/include/configs/tbs2910.h
+++ b/include/configs/tbs2910.h
@@ -51,6 +51,10 @@
 #define CONFIG_CONSOLE_MUX
 #define CONFIG_CONS_INDEX		1
 
+#define CONFIG_PRE_CONSOLE_BUFFER
+#define CONFIG_PRE_CON_BUF_SZ		4096
+#define CONFIG_PRE_CON_BUF_ADDR		0x7C000000
+
 /* *** Command definition *** */
 #define CONFIG_CMD_BMODE
 #define CONFIG_CMD_MEMTEST