linuxdriver: kernel4.19 "struct dma_buf_ops" have changed [1/1]

PD#SWPL-2814

Problem:
because "struct dma_buf_ops" have changed, so compile failed

Solution:
use "struct dma_buf_ops" according to the kernel version

Verify:
Android P + G12A(U200)

Change-Id: I47573d1cfcdc942e4de2ac2c92938ebc4bc975d9
Signed-off-by: Liqiang Jin <liqiang.jin@amlogic.com>