Add kmalloc/kcalloc/kzalloc/kfree Linux compat functions.
Add kmalloc/kcalloc/kzalloc/kfree Linux compat functions.

discussed with jsg@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars