Revert "Handle "hardware" bootconfig parameter as "androidboot.hardware""

This reverts commit 0a799bdfd607b729e94796e414d406839d6ad6ad.
Now that the kernel bootconfig feature has been to updated to handle
mixed subkeys and values, androidboot.hardware parameter is supported.

Test: build and boot Cuttlefish with "androidboot.hardware=cutf_vm"
Bug: 191502832
Change-Id: I0e436a27730d20689bc6974562c3e88d744385db
3 files changed