Fixes to linker script generation for big endian toolchain

2013-02-06  Simon Cook  <simon.cook@embecosm.com>

    * emulparams/arcebelf.sh: Added big endian elf emulation parameters.
    * emulparams/arcebelf_prof.sh: Likewise.
    * configure.tgt: Added rules for big endian emulations.
    * Makefile.am: Likewise.
    * Makefile.in: Regenerated.