bitbake: bitbake: bb: Drop deprecated functions

These functions in the main bb module have long been deprecated
and moved to other modules. Finally remove the compatibility links.

(Bitbake rev: ccd181c3ed4852e2b9169cf19aaf18aeacddcc18)

(Bitbake rev: d7f817518c5df2524a4bcf008ba63c71a8eb48bb)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>