bnxt_en: Re-arrange bnxt_hwrm_func_qcaps().

Re-arrange the code so that the generation of the random MAC address for
the VF is at the end of the function.  The next patch will add one more step
to call bnxt_approve_mac() to get the firmware to approve the random MAC
address.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>