mini-keyctl is a binary used to load channel keys to .fsverity keyring.
This CL creates a new domain for mini-keyctl and a type for /proc/keys
and adds allow rules needed by this binary.
Bug: 112038861
Test: manual
Merged-In: I3b744d302859a02dfe63c81c7f33bb30912d7994
Change-Id: I3b744d302859a02dfe63c81c7f33bb30912d7994