firmware: imx: scu-pd: fix cm40 power domain

The postfix needs to be false. Alought compiler use 0 for postfix now,
and take start_from as 0, it is better we add explicit false to postfix.

Fixes: 705dcca9("firmware: imx: scu-pd: add power domain for I2C and INTMUX in CM40 SS")
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>