brcm80211: fmac: initialize host interface drivers regardless result

The module init function of brcmfmac calls init functions for SDIO and
USB doing driver registration. This patch removes terminating the module
init when a driver registration for one host interface fails.

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