util: Fix compiling set_dmabuf_name() using older kernel headers

The DMA_BUF_SET_NAME_B ioctl isn't defined in older versions of kernel'sdma-buf.h and compilation fails in that case. Check whether ioctl is defined rather than header file presents to fix the build issue reported on !1330 (comment 2360461)

Cc: @pepp @theofficialgman