[scudo] Disabling the interface test on armhf

Summary:
I will investigate the breakage tomorrow, disable on armhf to turn the bots
green over the night.

http://lab.llvm.org:8011/builders/clang-cmake-thumbv7-a15-full-sh/builds/2952/steps/ninja%20check%202/logs/FAIL%3A%20Scudo-armhf%3A%3A%20interface.cpp

This is post https://reviews.llvm.org/D41128.

Reviewers: alekseyshl

Subscribers: aemerson, kristof.beyls, llvm-commits, #sanitizers

Differential Revision: https://reviews.llvm.org/D41218

llvm-svn: 320665