LU-12270 o2iblnd: pci_unmap_addr() removed in 4.19

LU-12270 o2iblnd: pci_unmap_addr() removed in 4.19

Since kernel 4.19 the pci_unmap_addr() wrappers have
been removed, along with linux/pci-dma.h
We can use the good old DEFINE_DMA_UNMAP_ADDR instead
of DECLARE_PCI_UNMAP_ADDR.

Linux-commit: 18b01b16e8bae9cd227909f6e6d2783d74855f65

Test-Parameters:trivial
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Change-Id: I387bd3d1c4e8c3bc75400ce1be05132fb25f8a50
Reviewed-on: https://review.whamcloud.com/34827
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Chris Horn <hornc@cray.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>