Fix some missing commands, cleanup header files
(autoscript, bmp, bsp, fat, mmc, nand, portio, ...)
diff --git a/board/exbitgen/u-boot.lds b/board/exbitgen/u-boot.lds
index 863a7e4..36f9491 100644
--- a/board/exbitgen/u-boot.lds
+++ b/board/exbitgen/u-boot.lds
@@ -119,6 +119,10 @@
   _edata  =  .;
   PROVIDE (edata = .);
 
+  __u_boot_cmd_start = .;
+  .u_boot_cmd : { *(.u_boot_cmd) }
+  __u_boot_cmd_end = .;
+
   __start___ex_table = .;
   __ex_table : { *(__ex_table) }
   __stop___ex_table = .;