Sepolicy: Fix APEX boot integrity

Update copy-paste comment header. Fix file access to the right
type.

Follow-up to commit 1845b406fc3ccfa5d63a3aa4dfa174391dac19bf.

Bug 125474642
Test: m
Test: boot

Change-Id: I33bfef51c78ca581063c0f950e1837546d013050
1 file changed