Add persisent device if FIPS is enabled

mkdumprd has a code to add a disk to kdump initramfs, in case FIPS is
enabled and /boot is on a separate partition. This code used to work,
since dracut was not force checking that added disk is in fact
available. Since dracut commit c79fc8f dracut in fact checks for added
device, and since disk name could have been changed between live system
and kdump initramfs, kdump can fail.
To resolve this problem we re-use get_persistent_dev from
dracut-functions.sh which will be sourced by mkdrumpd to get persistent
device name.

Signed-off-by: Alex Burmashev <alexander.burmashev@oracle.com>
Signed-off-by: Harshvardhan Jha <harshvardhan.j.jha@oracle.com>

Author: hvj7

mkdumprd

@@ -433,8 +433,9 @@ if ! is_fadump_capable; then
 	# to /sysroot beforehand.
 	if [[ $(cat /proc/sys/crypto/fips_enabled 2> /dev/null) == 1 ]]; then
 		_boot_source=$(findmnt -n -o SOURCE --target /boot)
+		_disk_persistent=$(get_persistent_dev "$_boot_source")
 		if mountpoint -q /boot; then
-			dracut_args+=(--add-device "$_boot_source")
+			dracut_args+=(--add-device "$_disk_persistent")
 		else
 			add_mount "$_boot_source"
 		fi