Do not rely on android_is_in_vendor_process

android_is_in_vendor_process is used to check if the function is called
from the system process. However, implementation would not work as
expected once VNDK deprecates. This change is to change logic from using
libvndksupport to directly check if current selinux context can access
to permission service.

Bug: 300366609
Test: aosp cf build succeded
Change-Id: I7cb904fe9910e5325132c68ca584eb964c84a79b