Add ELF loading support to LKL

[prp]

We want LKL to be able to load ELF executables and libraries using the binfmt_elf_fpdic format. This format supports the loading of regular ELF binaries on a non-MMU architecture.

This means that LKL must be compiled with CONFIG_ELFCORE and CONFIG_ BINFMT_ELF_FDPIC support. For this, we must include missing architecture-specific header files for ELF support under arch/lkl.

[prp]

I presume that this was closed by accident?