bnxt_en: call pci_alloc_irq_vectors() after bnxt_reserve_rings()

On some architectures (e.g. ARM), calling pci_alloc_irq_vectors()
will immediately cause the MSIX table to be written.  This will not
work if we haven't called bnxt_reserve_rings() to properly map
the MSIX table to the MSIX vectors reserved by FW.

Fix the FW error recovery path to delay the bnxt_init_int_mode() ->
pci_alloc_irq_vectors() call by removing it from bnxt_hwrm_if_change().
bnxt_request_irq() later in the code path will call it and by then the
MSIX table is properly mapped.

Fixes: 4343838c ("bnxt_en: Replace deprecated PCI MSIX APIs")
Suggested-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>