libertas: rename persistcfg.c -> mesh.c

mesh.c will be the file where we concentrate all mesh-related
code. This allows us to either add a KConfig entry for mesh and
makes matters easier for the cfg80211 transition.
Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/Makefile

@@ -5,7 +5,7 @@ libertas-y += cmdresp.o
 libertas-y += debugfs.o
 libertas-y += ethtool.o
 libertas-y += main.o
-libertas-y += persistcfg.o
+libertas-y += mesh.o
 libertas-y += rx.o
 libertas-y += scan.o
 libertas-y += tx.o