[oe] Deleting target specific folders from tmp directory

[Elvis Dowson]

Hi,
	I just noticed that if I have built a v2.6.31 kernel, then cleaned  
it, and then built a v2.6.29 kernel, and then do a console image, some  
artifacts from the previous 2.6.31 console image remains.

When I look at the rootfs installed on my mmc card, in the lib/ 
modules/ folder I can see 2.6.29-omap1 and 2.6.31-rc1-omap1 folders.  
That should not be there when I am building a linux-2.6.29 based  
console image recipe.

Now, I don't want to spend another 10 hours rebuilding my overo-oe  
environment from scratch, so which of the folder in the tmp directory  
can I safely delete?

cache
cross
deploy
pkgdata
rootfs
staging
stamps
usr
work

Best regards,

Elvis