check if top cb is null to avoid hard fault
top cb is allowed to be null in api so this is required
Signed-off-by: Declan Snyder <declan.snyder@nxp.com>
Updating the nxp,pit driver to support mutliple
channels. Updating the dts and board overlays
to account for the changes.
Signed-off-by: Emilio Benavente <emilio.benavente@nxp.com>
Declan Snyder