dt-bindings: media: rkisp1: Add second power domain on i.MX8MP

dt-bindings: media: rkisp1: Add second power domain on i.MX8MP

In the NXP i.MX8MP, the pclk clock required by the ISP is gated by the
MIPI CSI-2 power domain. Add it to the power-domains property, and
require specifying power-domain-names accordingly.

Link: https://lore.kernel.org/r/20250616011115.19515-3-laurent.pinchart@ideasonboard.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>