iwm: switch 7260 devices to new firmware

[Stefan Sperling]

This switches 7260 iwm(4) devices to the iwm-7260-17 firmware image
which has been available via fw_update in -current for a while.

iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless AC 7260" rev 0x73, msi
iwm0: hw rev 0x140, fw ver 17.-1078622920.0, address xx:xx:xx:xx:xx:xx

This firmware seems to work fine since my most recent commits to the driver.
Tested also in bsd.rd.

ok?

diff 7e2975b685e9b68ec42d557370a6fe7d530ff8d5 /usr/src
blob - da9a807015a64cd002bbcae5dd9a14de9c462c4c
file + sys/dev/pci/if_iwm.c
--- sys/dev/pci/if_iwm.c
+++ sys/dev/pci/if_iwm.c
@@ -8153,7 +8153,7 @@ iwm_attach(struct device *parent, struct device *self,
                break;
        case PCI_PRODUCT_INTEL_WL_7260_1:
        case PCI_PRODUCT_INTEL_WL_7260_2:
-               sc->sc_fwname = "iwm-7260-16";
+               sc->sc_fwname = "iwm-7260-17";
                sc->host_interrupt_operation_mode = 1;
                sc->sc_device_family = IWM_DEVICE_FAMILY_7000;
                sc->sc_fwdmasegsz = IWM_FWDMASEGSZ;