Update git submodules

* Update trusty/user/app/sample from branch 'master'
  to 23a5daf94249893af82423ab307a17a63459a148
  - [libc-test] Fix UBSan issue
    
    128 would be implicit converted to -128 when using char array.
    Use unsigned char array to fix this issue.
    
    Bug: 119111590
    
    Change-Id: I225a0b671587c039e0bfa16b012b1a220ff223c4
    
1 file changed