mac80211: group brcmfmac patches into sets as they were sent

It doesn't change any single patch (or order), it only renames files.
This creates some place for more backports, as we were already using
398 prefix which left only 1 slot.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@48163 3c298f89-4303-0410-b956-a3cf2f4a3e73