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
    
diff --git a/external/lk b/external/lk
index b269d09..b32b4a3 160000
--- a/external/lk
+++ b/external/lk
@@ -1 +1 @@
-Subproject commit b269d099027aa803931d818bc5a3c42414fcb856
+Subproject commit b32b4a34ec8646d61c385b79b3f1b0b4fb7ebd1a