ARM: dts: imx6ul.dtsi: add missing cells for ocotp

ARM: dts: imx6ul.dtsi: add missing cells for ocotp

This fixes below compilation warnings by adding address-cell and size-cell
in ocotp-ctrl@021bc000.

Warning (avoid_default_addr_size): /soc/aips-bus@2100000/ocotp-ctrl@021bc000/calib@38: Relying on default #address-cells value
Warning (avoid_default_addr_size): /soc/aips-bus@2100000/ocotp-ctrl@021bc000/calib@38: Relying on default #size-cells value
Warning (avoid_default_addr_size): /soc/aips-bus@2100000/ocotp-ctrl@021bc000/temp-grade@20: Relying on default #address-cells value
Warning (avoid_default_addr_size): /soc/aips-bus@2100000/ocotp-ctrl@021bc000/temp-grade@20: Relying on default #size-cells value

Signed-off-by: Arulpandiyan Vadivel <arulpandiyan_vadivel@mentor.com>