imx: imx8ulp: upower: replace magic number with macro

imx: imx8ulp: upower: replace magic number with macro

The swton indicates the logic switch, magic number 0xfff80 is hard
to understand, so use macro.

Some board design may not have MIPI_CSI voltage input connected per
data sheet. In that case, the upower power on API may dead loop mu to wait
response, however there is no response. So remove MIPI_CSI here, let
linux power domain driver to runtime enable the power domain.

Reviewed-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>