kernel.bbclass: remove default module_autoload and module_conf values
kernel.bbclass is a common class for many different kernel versions,
and as such the default module_autoload and module_conf values that
it contains are not relevant, or out of date for most builds.
Individual kernel recipes or distros can better specify these
values to meet their needs.
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com>
