ACPI: TAD: Replace sprintf() with sysfs_emit()

ACPI: TAD: Replace sprintf() with sysfs_emit()

Replace sprintf() in *_show() callbacks of sysfs attributes with
sysfs_emit().

While the current implementation works, sysfs_emit() helps to prevent
potential buffer overflows and aligns with kernel documentation
Documentation/filesystems/sysfs.rst.

Tested on an x86_64 system with acpi_tad built as a module:

 - Inserted patched acpi_tad.ko successfully
 - Verified /sys/devices/platform/ACPI000E:00/time and /caps are
   accessible
 - Confirmed correct output from 'cat' with no dmesg errors

Signed-off-by: Sukrut Heroorkar <hsukrut3@gmail.com>
Link: https://patch.msgid.link/20250716123543.495628-1-hsukrut3@gmail.com
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>