Update git submodules

* Update trusty/kernel from branch 'master'
  to b76cff71f70b95f0bb264123353670b574e962a0
  - [lib][trusty] Destory uctx if exists
    
    Syscall exit_etc invokes all available shutdown callbak of notifier in
    application notifiers list. In this case, uctx teardwon would be
    invoked.
    
    Add condition check before destroy uctx of application. With this
    change, Trusty applicaiton could be created without uctx.
    
    Bug: 119111590
    Change-Id: I473186ec204ea808d790442f687bd262b9c56c2d
    
1 file changed