use adb shell instead of shell driver, since the former is more robust.

Test: run vts -m SecurityPoCKernelTestStaging
Change-Id: Ibe3c674f0aa5eb1000361d1f5c26ae0859daba8b
(cherry picked from commit da9e40ec19a5e099613fcedb374e6185b5be9173)
1 file changed
tree: 10037ad944c24e616bc7554e4dac060c44710fdf
  1. poc/
  2. __init__.py
  3. Android.mk