ARM: highbank: convert to generic board

Enable CONFIG_SYS_GENERIC_BOARD on highbank.

Signed-off-by: Rob Herring <robh@kernel.org>
diff --git a/include/configs/highbank.h b/include/configs/highbank.h
index a6202cf..da1c837 100644
--- a/include/configs/highbank.h
+++ b/include/configs/highbank.h
@@ -13,6 +13,7 @@
 #define CONFIG_SYS_THUMB_BUILD
 
 #define CONFIG_SYS_NO_FLASH
+#define CONFIG_SYS_GENERIC_BOARD
 
 #define CONFIG_OF_BOARD_SETUP
 #define CONFIG_FIT