Intel Arc Pro B50 detected by system but not showing up in lsgpu

[LarsR]

B series is not yet supported

@HoneyBadger

As an alternative, for transcoding focused workloads, TrueNAS 25.10 includes support for the Intel ARC A-series “Alchemist” GPUs through the i915 open source driver. Support for ARC B-series “Battlemage” GPUs is still pending confirmation of kernel compatibility and functionality with the xe driver required for these GPUs.