Add Xreal Air 2 and Air 2 Pro to supported devices

Depends on: monado/utilities/xr-hardware!31 (merged), monado!2150 (merged)

Once both PRs are merged, I will mark this PR as ready for review.

P.S: the default branch should be changed from master to main for consistency.

P.P.S: I would appreciate it if issues could be enabled for this repository so that issues such as the one mentioned in the P.S. could be their own separate issue.