cnss2: Remove redundant checking from fw_ready_hdlr

Move some redundant checkings from fw_ready_hdlr function to
call_driver_probe function. call_driver_probe function should
be the final place to decide what to do for most of cases.

Change-Id: Ic21b81f63af6ab2900cee60fd88842e3da4b6274
Signed-off-by: Yue Ma <yuem@codeaurora.org>