CVE-2024-26587 net: netdevsim: don't try to destroy PHC on VFs

In the Linux kernel, the following vulnerability has been resolved: net: netdevsim: don't try to destroy PHC on VFs PHC gets initialized in nsiminitnetdevsim, which is only called if nsimdevportispf. Create a counterpart of nsiminitnetdevsim and move the mockphcdestroy there. This fixes a crash...