mac80211: brcm: drop brcmfmac patch waiting for register_wiphy()

mac80211: brcm: drop brcmfmac patch waiting for register_wiphy()

That was a workaround for OpenWrt generation of config files. This patch
was used to postpone returning from probe function until loading
firmware and calling register_wiphy().

All of that is not needed anymore thanks to the ieee80211 hotplug.d
script introduced in the commit 5f8f8a366136 ("base-files, mac80211,
broadcom-wl: wifi detection and configuration"). That takes care of
generating /etc/config/wireless entries even if wireless device appears
late in the booting process.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>