LoongArch: Fix potential ADE in loongson_gpu_fixup_dma_hang()

...

AZL-89121 CVE-2026-46156 affecting package kernel for versions less than 6.6.141.1-1

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Fix potential ADE in loongsongpufixupdmahang The switch case in loongsongpufixupdmahang may not DC2 or DC3, and readlcrtcreg will access with random address, because the "device" is from "base+PCIDEVICEID", "base" is...