EP88x: fix broken linker script

Signed-off-by: Wolfgang Denk <wd@denx.de>
Tested-by: Mikhail Zaturenskiy <mzaturenskiy@shoppertrak.com>

board/ep88x/u-boot.lds

@@ -90,11 +90,13 @@ SECTIONS
   _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 = .;