meson: Only include virtio when DRM available
The unconditional inclusion of the `virtio` subdirectory introduced by !24733 causes a full dependency on DRM, it breaks any systems that have `system_has_kms_drm = false`, including Turnip with just the KGSL KMD. A temporary solution to this is gating the inclusion when `system_has_kms_drm` isn't set but this should be replaced with more specific gating in the future.
Signed-off-by: Mark Collins <mark@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26100>
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