kernel/ksysfs.c: simplify bin_attribute definition

The notes attribute can be implemented in terms of BIN_ATTR_SIMPLE().
This saves memory at runtime and is a preparation for the constification
of struct bin_attribute.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20241121-sysfs-const-bin_attr-ksysfs-v1-1-972faced149d@weissschuh.net


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