msm: cpu: Add l2 and core initialization sequences for titanium

1) msmtitanium has different power on sequence for its ARM cores,
   so add new L2 and core initialization sequences.
2) Add new cpu_ops and enable-method.
3) Also use simple wfi based hotplug call-back.

Change-Id: Ibcaa6f93d3e28924f55e6950498dc6f0d953b548
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>