external: qrngd: Drop the device permission after device_open

hw_random device file is assigned to the user "root", so start as
root (as before) but drop the permission after device open.

Change-Id: I3c17bc02e510dbd7739cb1792a7f6f852f413cb8
Merge "external: qrngd: Drop the device permission after device_open"
qrngd: make changes for qrngd on redfox64

Remove qrngd and qrngp as user daemon is not required to read data form RNG hardware
and add entropy to /dev/random. This is being done by a kernel thread in hw_random

Change-Id: Ie307641400f4dfadeabd9d3e3118aea60805b67a
Merge "qrngd: make changes for qrngd on redfox64"