CVE-2024-35990 dma: xilinx_dpdma: Fix locking

In the Linux kernel, the following vulnerability has been resolved: dma: xilinxdpdma: Fix locking There are several places where either chan-lock or chan-vchan.lock was not held. Add appropriate locking. This fixes lockdep warnings like 31.077578 ------------ cut here ------------ 31.077831...