r: remap keyboard events

Re-mapped the following keyboard inputs:
    BACK->PAGEUP
    MENU->PAGEDOWN
    POWER->ENTER

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Merge branch 'boundary-imx_3.0.35_4.1.0' of github.com:boundarydevices/linux-imx6 into boundary-imx_3.0.35_4.1.0