Update git submodules

* Update external/lk from branch 'master'
  to bc7af854d7e14472e27c2baf0c4ccbdb83d41ae5
  - [make] Support to build userspace with HWASan
    
    Bug: 148877030
    Test: com.android.trusty.hwasan.user.test
    Change-Id: I94df1426f1b6058b1b6cf6d372f8622c9070c3a7
    
1 file changed