net: ll_temac: Cleanup for function name in a string

As Checkpatch.pl warns, prefer using '"%s...", __func__'
to using 'temac_device_reset', this function's name, in a string.

Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Reviewed-by: Harini Katakam <harini.katakam@amd.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>