msm: krait-regulator: initialize registers in global space

For the retention mode to work we have to initialize a register in
the global space. This register enables the bimodal switch that controls
whether a cpu is powered by the head switch or an LDO.

Change-Id: I8f7de5f63bbb8af63b118a29d1dec77cd09fc359
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>