Input: xpad - fix inverted Y and RY axes

The commit ae91d10a inverted Y and RY
axes on xbox360 so that up is positive and down is negative.
This is wrong, as axes on game controllers have up as negative per
convention. Also, even xpad itself reports HAT0X with up as negative.

Fix that by inverting them again.

Also, according to http://bugzilla.kernel.org/show_bug.cgi?id=10337

 the
original xbox controllers also have the Y and RY axes inverted.
Fix that by inverting them as well.

Cc: Brian Magnuson <bdmagnuson@gmail.com>
Signed-off-by: Anssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>