brcm80211: fmac: stop using brcmf_pub in brcmf_sdbrcm_bus_watchdog

brcm80211: fmac: stop using brcmf_pub in brcmf_sdbrcm_bus_watchdog

structure brcmf_pub contains context for generic layer and should
not be used in brcmf_sdbrcm_bus_watchdog. This patch is part of
fullmac bus interface refactoring.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>