iprowifi4965: Upgrade to FreeBSD 12.

Tested on a ThinkPad T61.

iprowifi4965: Add the missing IWN_SDID_6035_5 subdevice.

This goes with the "IWN_DID_6035_2" (0x088F) device ID. We had added the device
ID in the FreeBSD 9 version of the driver, which didn't properly handle the
device but somehow still managed to use it.

Thanks to miqlas for reporting and then confirming this fix.

iprowifi4965: Sync with FreeBSD 11.1.

Tested and verified as working on my Lenovo ThinkPad T61.