arm: mx6: Remove SPI support from WRU-IV baseboard

This patch removes the SPI support from the WRU-IV baseboard as its
not used at all.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Clemens Gruber <clemens.gruber@pqgruber.com>
Cc: Markus Niebel <Markus.Niebel@tq-group.com>
Cc: Stefano Babic <sbabic@denx.de>
Tested-by: Clemens Gruber <clemens.gruber@pqgruber.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
diff --git a/include/configs/tqma6_wru4.h b/include/configs/tqma6_wru4.h
index 1c86bc0..1330a0a 100644
--- a/include/configs/tqma6_wru4.h
+++ b/include/configs/tqma6_wru4.h
@@ -68,4 +68,12 @@
 #define CONFIG_SYS_BOOTCOUNT_ADDR	IRAM_BASE_ADDR
 #define CONFIG_SYS_BOOTCOUNT_BE
 
+/*
+ * Remove all unused interfaces / commands that are defined in
+ * the common header tqms6.h
+ */
+#undef CONFIG_CMD_SF
+#undef CONFIG_CMD_SPI
+#undef CONFIG_MXC_SPI
+
 #endif /* __CONFIG_TQMA6_WRU4_H */