[ALPS04653992] SEPolicy: mmap permission for app

[Detail]
In kernel 4.14, selinux security need to check if the process has the
map permission of mmap inode. App need the map permission to
read radio_data_file.

[Solution]
Add map permission for app to read radio_data_file.

MTK-Commit-Id: 698e603818ff37a59212a37a41ecbec8e8e30233

Change-Id: I8982ddbff40cfd7280c0a3dc5e8d2f6b6394e747
CR-Id: ALPS04653992
Feature: [Android Default] SELinux, SEAndroid, and SE-MTK