Add rockchip-isp1 to modules-initfs as a workaround for display initialization
issues on kernel 6.11.11. Without the ISP driver built into initramfs, the
unl0kr screen fails to display during early boot when disk encryption is
enabled, though the input still works. Building rockchip-isp1 into initramfs
ensures proper display initialization.
This is a temporary workaround until the underlying power domain or clock
synchronization issue between the display and camera subsystems which I suspect
can be properly investigated and fixed.
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/5955>