Add OldGrid field for GridOption so we can properly filter out the old grids when the flag is on

Bug: 364711064
Flag: com.android.launcher3.one_grid_specs
Test: NexusLauncherImageTests, DeviceProfileDumpTest
Change-Id: I8e3ff70d2f3008d1de7c8419290ff44c18c72e70
2 files changed