CM3: AM43XX: Add Tamper swakeup settings

Provision of swakeup from Tamper source is a new addition for
AM43XX lineup SOCs.

So, below things are implemented :-

1. Tamper entry is made into list of swakeup sources.
2. Settings inside Configure/Clear wake-up source APIs.
3. Modified handlers(specific to AM43xx) to add Tamper swakeup.

Signed-off-by: ankur <a-kishore@ti.com>