libertas: single out mesh code

[Holger Schurig]

This patches adds the two functions wlan_add_mesh() and 
wlan_remove_mesh(),  which are responsible for the mshX 
interface. In a CF driver with a non mesh-aware firmware you can 
omit the calls to this functions.

Signed-off-by: Holger Schurig <hs4233 at mail.mn-solutions.de>

http://git.infradead.org/?p=users/schurig/libertas-cleanups-2.6.git;a=commitdiff;h=5a62190043ea56d2c3f8e0bb2bc9e61d1ca7cc41