drivers: soc: qcom: pm: Add legacy PM and Warmboot set address API support

Add legacy msm pm sleep mode support for MSM8909 target.

Add warmboot set address support for multi cluster cpu's.

Snapshot is taken from msm-3.18 kernel version @ commit 9bbf4c38e5b9e8
("soc: qcom: bgrsb: Increase time out for RSB channel opening")

Change-Id: Ia90f7b97e4cfaf6a691d178968cb515da6e9ddc0
Signed-off-by: Chinkit Kumar,Kirti Kumar Parmar <parma@codeaurora.org>
Signed-off-by: Sundara Vinayagam <sundvi@codeaurora.org>