drm/xe/xe_gt_idle: Drop redundant newline in name

Newline in name is redunant and produces an unnecessary empty line during
'cat name'. Newline is added during sysfs_emit. See '27a1a1e2 ("drm/xe:
stringify the argument to avoid potential vulnerability")'.

v2: Add Fixes tag (Riana)

Fixes: 7b076d14

 ("drm/xe/mtl: Add support to get C6 residency/status of MTL")
Reviewed-by: Riana Tauro <riana.tauro@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>