Description of problem:
The kerberos AP phase doesn't enable the mutual-required flag, which may cause problems with CIFS servers that require it.

Version-Release number of selected component (if applicable):
cifs-utils-7.0-1.el8_8.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Configure a kerberos CIFS share
2. Try to mount the share by using kerberos

Actual results:
The CIFS client is not able to set the mutual-required flag

Expected results:
The CIFS client should be able to set the mutual-required flag

Additional info: