soc: qcom: Refactor subsystem registration process

Restructure subsystem registration process and IRQ registration
step such that, both subsystem restart framework and secure pil
drivers should be able to handle all the asychronous events
coming from subsystem. If both subsystem restart framework
and secure pil drivers are not in proper state to handle
asychronous events from subsystem leading to kernel faults.

Change-Id: Iacda38a9d7d4aeb4549f45533c91791f096c3b1c
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>