media: rzg2l-cru: csi2: Use devm_pm_runtime_enable()

media: rzg2l-cru: csi2: Use devm_pm_runtime_enable()

Use newly added devm_pm_runtime_enable() into rzg2l_csi2_probe() and
drop error path accordingly. Drop also unnecessary pm_runtime_disable()
from rzg2l_csi2_remove().

Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://lore.kernel.org/r/20250411170624.472257-6-tommaso.merciai.xr@bp.renesas.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>