'idt' is misspelled 'itd' in a few places, fix it.

Fixes: 34662f6e ("dt: Add additional option bindings for IDT VersaClock")
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200723074112.3159-2-luca@lucaceresoli.netSigned-off-by: Stephen Boyd <sboyd@kernel.org>