[oe] kernel bbclass changes

[Koen Kooi]

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Hi,

I've merged the changes from poky to make the kernel use new style
staging and it seems to be working fine.

There's one cosmetic bit I'm not happy about: it spews every entry we
stage as 'unpackaged', since ${D}/kernel isn't in FILES_foo. Do we want
to create a dummy kernel-staging package that includes those to get rid
of these warnings?

regards,

Koen
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