misc: ocxl: Replace scnprintf() with sysfs_emit() in sysfs show functions

Replace scnprintf() with sysfs_emit() in sysfs show functions.
These helpers are preferred in sysfs callbacks because they automatically
handle buffer size and improve safety and readability.

Signed-off-by: Ankit Chauhan <ankitchauhan2065@gmail.com>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250620024705.11321-1-ankitchauhan2065@gmail.com