v3dv: implement vkCmdBindIndexBuffer2KHR

This is added with VK_KHR_maintenance5. It adds a size parameter
to track the size of the index buffer data bound.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29425>

src/broadcom/vulkan/v3dvx_cmd_buffer.c

@@ -2747,7 +2747,7 @@ v3dX(cmd_buffer_emit_index_buffer)(struct v3dv_cmd_buffer *cmd_buffer)
       assert(ibuffer->mem->bo->size >= offset);
       cl_emit(&job->bcl, INDEX_BUFFER_SETUP, ib) {
          ib.address = v3dv_cl_address(ibuffer->mem->bo, offset);
-         ib.size = ibuffer->mem->bo->size - offset;
+         ib.size = cmd_buffer->state.index_buffer.size;
       }
    }