drm/amdgpu: Limit BO list entry count to prevent resource exhaustion

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

drm/amdgpu: Limit BO list entry count to prevent resource exhaustion

Userspace can pass an arbitrary number of BO list entries via the

bo_number field. Although the previous multiplication overflow check

prevents out-of-bounds allocation, a large number of entries could still

cause excessive memory allocation (up to potentially gigabytes) and

unnecessarily long list processing times.

Introduce a hard limit of 128k entries per BO list, which is more than

sufficient for any realistic use case (e.g., a single list containing all

buffers in a large scene). This prevents memory exhaustion attacks and

ensures predictable performance.

Return -EINVAL if the requested entry count exceeds the limit

(cherry picked from commit 688b87d39e0aa8135105b40dc167d74b5ada5332)