Update git submodules

* Update external/lk from branch 'master'
  to b32b4a34ec8646d61c385b79b3f1b0b4fb7ebd1a
  - [lib][libc] Add a few standard functions to endian.h.
    
    Bug: 110161494
    Change-Id: I8456d5ba6ba7024632dc6ce02a3577b93fdd64be
    
1 file changed