drm/xe/xe_hw_engine_class_sysfs: use sysfs_emit() for attr's _show()

drm/xe/xe_hw_engine_class_sysfs: use sysfs_emit() for attr's _show()

sprintf() is deprecated for sysfs, use preferred sysfs_emit() instead.

v2: used sysfs_emit instand of sprintf

Signed-off-by: Bommu Krishnaiah <krishnaiah.bommu@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Tejas Upadhyay <tejas.upadhyay@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231209235949.54524-3-krishnaiah.bommu@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>