Add the 0.8GHz and 1GHz opps. According to the datasheet:
https://www.nxp.com/docs/en/data-sheet/IMX8MDQLQIEC.pdf
section 3.1.3 Operating ranges.

The 0.8GHz opp runs in nominal mode with the regulator set to 0.9V.
The 1GHz runs in overdrive mode with the regulator set to 1V.
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>