i915g: drop alignment parameter from iws->buffer_create

i915g: drop alignment parameter from iws->buffer_create

It's unnecessary. The kernel gem ignores it totally and we can't
run on the old userspace fake bo manager due to lack of dri2.

Also drop the redundant name string from the sw winsys as suggested
by Jakob Bornecrantz

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Jakob Bornecrantz <wallbraker@gmail.com>
Signed-off-by: Jakob Bornecrantz <wallbraker@gmail.com>