CVE-2026-74415: spi: atcspi200: fix use-after-free when driver unbind

In the Linux kernel, the following vulnerability has been resolved:

spi: atcspi200: fix use-after-free when driver unbind

DMA resource is initialized after SPI controller registration. So when driver unbind, this can trigger a use-after-free when DMA is torn down while the controller is still alive and triggers DMA transfers.