brcmf_sdbrcm_isr doesn't access to the dongle through SDIO bus.
Stop releasing and claiming host in irq handler to eliminate
any potential risk.
Reviewed-by: NPieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: NArend van Spriel <arend@broadcom.com>
Signed-off-by: NFranky Lin <frankyl@broadcom.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>