drm/xe/xe_sriov_vfio: Fix return value in xe_sriov_vfio_migration_supported()

drm/xe/xe_sriov_vfio: Fix return value in xe_sriov_vfio_migration_supported()

The xe_sriov_vfio_migration_supported() function is type bool so
returning -EPERM means returning true.  Return false instead.

Fixes: 17f22465c5a5 ("drm/xe/pf: Export helpers for VFIO")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/aTLEZ4g-FD-iMQ2V@stanley.mountain
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>