wpa_supplicant(hidl): Don't send negative disconnect reason codes

wpa_supplicant's core uses negative reason codes to inform the
control interface that the disconnect was locally generated, this
however does not need to be propagated to the HIDL clients. The
locally_generated bit should be enough to inform the HIDL clients that
the disconnect was generated locally.

Bug: 64521966
Test: Will send for regression tests.
Change-Id: Ie5a2c36003626332c028556e49bd746f2b806986
1 file changed