dts: arm: nxp: imx95: m7: disable disp_irqsteer

This is a workaround to fix a bug that failed
to access registers of display irqsteer when
display mix is in power off state.
- Display irqsteer is in display mix, need to
  power on display mix firstly.

Signed-off-by: Biwen Li <biwen.li@nxp.com>