Revert "Added check for misprovisioned Pixel 2 device."

Revert "Minor changes to check for misprovisioned Pixel 2 devices"

This reverts commits f1bbe75e and
e238d589.
This code is no longer needed as Pixel 2 devices are not supported
on master.

Bug: 156316516
Test: atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testKeyManagement
Change-Id: Ia32b1712b53d4bc72118507c5177ff5db5fa6cdc