ps2port: Disable keyboard/mouse prior to resetting ps2 controller

ps2port: Disable keyboard/mouse prior to resetting ps2 controller

If one of the ps2 ports is enabled prior to the ps2 controller reset
then it is possible a device event (eg, key press or mouse move) could
be mistaken for the controller reset response code.  This would result
in a failure and the keyboard would be disabled during the boot.
Always disabling the keyboard and mouse prior to reset ensures that
the controller reset return code can be read properly.

Tested-by: Paul Menzel <paulepanter@users.sourceforge.net>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>