Revert "meta-google: Add Arc firmware manager" This reverts commit b75b9dc2c730b332241b2d470e0f7906130dfc89. Reason for revert: this should be in meta-google-gbmc due to arc repo being internal for now, will re-add later on after repo is created. Google-Bug-Id: 484503384 Fusion-Link: fusion2 n/a Tested: Yes, repeated tests with two different firmware packages. Change-Id: Ic3e9011955f4e6fa4d8bbfd05c4ed8023f90559a