kheaders: Simplify attribute through __BIN_ATTR_SIMPLE_RO()

The utility macro from the sysfs core is sufficient to implement this
attribute. Make use of it.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20241221-sysfs-const-bin_attr-kheaders-v2-1-8205538aa012@weissschuh.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>