qcom: scm-boot: Add support for multi-cluster scm-boot apis

Add support for setting the cold/warmboot address for secondary
cpus via system call to secure-os.

Change-Id: Id7f52e75eb5e0ca6379f672f04fbc5e05cec1af3
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>