dt-bindings: arm: fsl: Add E70K02 based ebook readers

Add the Kobo Libra H2O and Tolino Vision 5.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>