Update git submodules

* Update external/lk from branch 'main'
  to d93bb04ac494797c584c36c3bbcb2208a891055b
  - trusty: arm32: fix potential double fault when printing diagnostics
    
    When dumping_mode_regs() on a fault, avoid printing the stack beyond the
    current page.  This prevents exceeding the stack base and hitting a
    guard page in the case the stack use is < 128 bytes.
    
    Bug: 336957655
    Test: crash test, observe double fault fixed
    Change-Id: If49b5fe5e1651557d19bf18c4026224cfb038101
    
1 file changed