media: rockchip: rga: disable multi-core support

media: rockchip: rga: disable multi-core support

Disable multi-core support in preparation of the RGA3 addition. The
RK3588 SoC features two equal RGA3 cores. This allows scheduling of the
work between both cores, which is not yet implemented. Until it is
implemented avoid exposing both cores as independent video devices to
prevent an ABI breakage when multi-core support is added.

This patch is copied from the Hantro driver patch to disable multi core
support by Sebastian Reichel. See
commit ccdeb8d57f7f ("media: hantro: Disable multicore support")

Link: https://lore.kernel.org/all/20240618183816.77597-4-sebastian.reichel@collabora.com/
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Sven Püschel <s.pueschel@pengutronix.de>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>