soc: qcom: initialize the spin_lock before cpu_pm_callback

There is a possible race condition that cpu_pm_callback get here
while lock is not initialized.

CRs-Fixed: 2300081
Change-Id: Iaa7974f5181ee0739f6f821fcb5c708b6b42b25e
Signed-off-by: Biao long <blong@codeaurora.org>