[OE-core] sstate skips STAGING_DIR_KERNEL?

[Tom Rini]

Hey all,

As part of looking into the problem I had that I just posted a patch for
I was going "why isn't -c clean (or cleanall or cleansstate) knocking
out STAGING_DIR_KERNEL contents?  Answer, sstate is totally skipping
that out.  Is there some variable we need to be setting somewhere to add
this in?  Or are we going to have to take in the various bits of OE.dev
kernel.bbclass instead here?

-- 
Tom Rini
Mentor Graphics Corporation