MLK-18517-2: CSI: simplified mipi and parallel csi suspend/resume implementation

MLK-18517-2: CSI: simplified mipi and parallel csi suspend/resume implementation

1. Delete power state maintenance of mipi and parallel csi.
This can simplified driver's resume/suspend implementation.

2. parallel_csi_power_control is a helper function which is
used to turn on/ff power domain of CI_PI. CI_PI will restore
its default parent clock for pixel clock after system resume
and can't be changed when its power is on. This issue is fixed
in scfw, more detail, please refer to "SCF-76". So remove it
in driver.

Signed-off-by: Guoniu.Zhou <guoniu.zhou@nxp.com>
Reviewed-by: Robby.Cai <robby.cai@nxp.com>