msm: Removed XPU violations.

During initialization, there is a violation in writing to
"read only" registers for targets that support trust zone.
Trustzone marks certain registers as read-only.
This change fixes the issue by writing to registers only
on targets that do not support trust zone.

Change-Id: I69bb0f1bad199201aa3dd8b378ca1683dfa81c86
Signed-off-by: Ramesh Masavarapu <rameshm@codeaurora.org>