qcacmn: Add the hang event infrastructure

As part of the new requirement to understand the reason for the
wifi hang the data need to be collected from the required modules
which will help in root-ca

qcacmn: Add the hang event infrastructure

As part of the new requirement to understand the reason for the
wifi hang the data need to be collected from the required modules
which will help in root-causing the reason for the hang.

Add the infrastructure so that the required modules can register for
this hang event notifier chain.

Change-Id: I32f1365eec1ad7d6e19be95e8faf9a980d054b76
CRs-Fixed: 2648304

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