Update git submodules

* Update external/lk from branch 'master'
  to f17a5e6706c45cfee109a6efa5ae161918804706
  - [kernel][vm] Expose vmm_find_region method
    
    vmm_find_region can be used to find a region in which specified
    virtual address resides.
    
    Bug: 119111590
    Change-Id: I9067723762419aac533adcaa49c36ab9cd573809
    
1 file changed