Description of problem:
When PVs are manually checked to be encrypted during custom partitioning in GUI, anaconda creates LUKS v1 format on the PVs. There is also no choice to select LUKS v1/v2 as for other device types (raw partitions or encrypded LVs)

Version-Release number of selected component (if applicable):
RHEL-8.0 GA
anaconda-29.19.0.40-1.el8

How reproducible:
always

Steps to Reproduce:
1. start graphical installation
2. proceed to custom partitioning
3. remove existing partitions
4. let anaconda create the partitions (LVM layout)
5. modify the volume group with rootfs and swap (and home)
6. check "Encrypt" in the VG configuration dialog
7. continue with the installation
8. reboot to installed system
9. check the LUKS version:
# cryptsetup luksDump /dev/vda2 | grep -i version

Actual results:
LUKS v1 is used:
[root@localhost ~]# cryptsetup luksDump /dev/vda2 | grep -i version
Version:        1
[root@localhost ~]#

Expected results:
LUKS v2 is used by default:
[root@localhost ~]# cryptsetup luksDump /dev/vdb1 | grep -i version
Version:        2
[root@localhost ~]#

Since it's possible to select LUKSv1/v2 for other types of devices, it should be possible to select the version for PVs as well.

Additional info:
When using encrypted autopartitioning, PVs are formatted with LUKS v2 as expected.