mmc: core: use sysfs_emit() instead of sprintf()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.16.19 by commit 659ca56b5415c7a1d05e185c36fad80ba165d063. For more details please see the references link.