arm: a9mpcore: remove un-used ptimer_iomem field I'm guessing this is a hangover from a previous coreification of the mptimer sub-module. This field is completely unused - removed. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>