Fix permissions for /firmware partition

/firmware partition holds sub-system images.  Mount this as 'system'
user (uid/gid: 1000) and make the default permissions as read only.

This is mainly being done to allow 'system' apps to load tzapps images
that exist in this partition.

Change-Id: Ica75e9aa509435bc86ee334629c05349c0b08da5
2 files changed