msm: Change the permission for pwrnap, policy, modem_wait sys entries

Sysfs files are not world writable. Allowing only
root to write to sysfs files to keep non-privileged
process from change the power policy.

CRs-Fixed: 327239
Change-Id: Ibe44e888c28f854996c8a4391d99fdb7e0edd602
Signed-off-by: Praveena Pachipulusu <pveena@codeaurora.org>
3 files changed