Reland "Remove legacy/O/O-MR1 matrices."

This reverts commit 540dc2771adfcf69da51b8933bc7cc3b2c73eefd.

Reason for revert: reland because target-level 2 are fixed

Bug: 163419744
Change-Id: I293852d50de9a4eeaeec6ccf4c0290f1c1b0012d
7 files changed