soc: qcom: ssr: Enable the irqs before powering up subsystems

Enabling the irqs from other subsystems before they power up. This
ensures that the irqs are not missed by hlos.

Change-Id: I501cf28c3ea7244358f26b0a2d95572022315871
Signed-off-by: Anuj Garg <anujgarg@codeaurora.org>