cnss: Fix load wlanhost driver failure with Genoa

If there is no regdb.bin on the target, request_firmware
API will search for it until happen timeout after 60s,
which cause the firmware download and QMI message exchange
could't be finished within 20s and cause failure. So use
the API request_firmware_direct to replace with request_firmware
that can avoid such too long time wait.

Change-Id: Ib61475ad8936285cd0344645ec8e19cc1f1fc89c
Signed-off-by: Chaoli Zhou <zchaoli@codeaurora.org>