liblp: Remove tests for alignment_offset being 0.

This test doesn't exist on AOSP anymore, and the bugs around
alignment_offset have been fixed in R. There is no need for the test
anymore.

Bug: 157398966
Test: liblp_test gtest
Change-Id: I00ac7486faf8db8b18f764e61db1d545feb0312c
Merged-In: I563122282e940e07a7ece97ed1a9846ad1f3253c