mac80211: brcmfmac: backport minor code cleanups

.../361-0001-brcmfmac-make-brcmf_of_probe-more-generic.patch

...rcmfmac-add-support-for-BCM43455-with-modalias-sdio.patch

...0003-brcmfmac-fix-incorrect-event-channel-deduction.patch

...rcmfmac-drop-unneeded-function-declarations-from-he.patch

...rcmfmac-move-brcmf_c_set_joinpref_default-declarati.patch

...-brcmfmac-drop-brcmf_bus_detach-and-inline-its-code.patch

...rcmfmac-rename-brcmf_bus_start-function-to-brcmf_bu.patch

...rcmfmac-drop-duplicated-core-selection-from-brcmf_p.patch

...es/860-brcmfmac-register-wiphy-s-during-module_init.patch