Because pci_alloc_consistent has been deprecated. We prefer to use
dma_alloc_coherent directly. Therefore, we should remove pci_alloc_consistent
to increase the confidence.

Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Acked-by: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>