msm_fb:hdmi:Fix for sysfs Entry Information Leaks

These sysfs entries leak logical and physical addresses
within the kernel and may be read by any user.
The read permissions for the sysfs entries changed
to S_IRUSR from S_IRUGO.

Change-Id: Idfc58c3b639ea4dfa105ff146467a1c4f01edb6e
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>