[brcmfmac] Support new join parameter structure versions

To support new join parameter versions, we move to using a function
pointer structure that knows how to deal with the different versions
of structures

Drive-by fix: Always count the assoc_params length even if no bssid is
provided. It doesn't make sense to truncate it off, since we need to set
the bssid to the broadcast addr anyway in that case.

Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Daniel Berlin <dberlin@dberlin.org>

Author: marcan

drivers/net/wireless/broadcom/brcm80211/brcmfmac/Makefile

@@ -25,6 +25,7 @@ brcmfmac-objs += \
 		btcoex.o \
 		vendor.o \
 		pno.o \
+		join_param.o \
 		scan_param.o \
 		xtlv.o