dt-bindings: fsl: scu: add new compatible string for ocotp

Add new compatible string "fsl,imx8qm-scu-ocotp" into binding
doc  for i.MX8 SCU OCOTP driver.

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20190818093345.29647-7-srinivas.kandagatla@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>