rt2x00: reset usb devices at probe

rt2x00: reset usb devices at probe

When module is reloaded, device may fail to work, with messages:

[  342.211926] phy40 -> rt2x00lib_rxdone_read_signal: Warning - Frame received with unrecognized signal, mode=0x0000, signal=0x0059, type=2.
[  342.314254] phy40 -> rt2x00lib_rxdone_read_signal: Warning - Frame received with unrecognized signal, mode=0x0000, signal=0x004a, type=2.
[  342.416458] phy40 -> rt2x00lib_rxdone: Warning - Wrong frame size 3183 max 2432.
[  342.518605] phy40 -> rt2x00lib_rxdone_read_signal: Warning - Frame received with unrecognized signal, mode=0x0000, signal=0x00c9, type=2.
[  342.620836] phy40 -> rt2x00lib_rxdone_read_signal: Warning - Frame received with unrecognized signal, mode=0x0000, signal=0x00ae, type=1.
[  342.723201] phy40 -> rt2x00lib_rxdone: Warning - Wrong frame size 0 max 2432.
[  342.825399] phy40 -> rt2x00lib_rxdone: Warning - Wrong frame size 0 max 2432.
[  342.927624] phy40 -> rt2x00lib_rxdone: Warning - Wrong frame size 0 max 2432.
[  343.029804] phy40 -> rt2x00lib_rxdone: Warning - Wrong frame size 2491 max 2432.
[  343.132008] phy40 -> rt2x00lib_rxdone: Warning - Wrong frame size 2576 max 2432.
[  343.234326] phy40 -> rt2x00lib_rxdone_read_signal: Warning - Frame received with unrecognized signal, mode=0x0000, signal=0x004c, type=1.
[  343.438723] phy40 -> rt2x00lib_rxdone_read_signal: Warning - Frame received with unrecognized signal, mode=0x0000, signal=0x00e6, type=1.

Whereas replugging device make it functional. To solve that problem
force reset device during probe.

With patch messages are gone. Unfortunately device may sometimes
still does not operate correctly after module reload (fail to receive
data after associate), but such cases are rarer than without the patch.

Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>