tpm: Replace scnprintf() with sysfs_emit() and sysfs_emit_at() in sysfs show functions

tpm: Replace scnprintf() with sysfs_emit() and sysfs_emit_at() in sysfs show functions

Documentation/filesystems/sysfs.rst mentions that show() should only
use sysfs_emit() or sysfs_emit_at() when formating the value to be
returned to user space. So replace scnprintf() with sysfs_emit().

Signed-off-by: Chelsy Ratnawat <chelsyratnawat2001@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>