[pwrmgr, top_darjeeling] internal_reset_req needs to be templated

[neeraj-rv]

Discussion from #22575 (comment); marked in code with TODO(#22711).

[neeraj-rv]

The internal reset request can come from multiple sources at the top level.
e.g. For Darjeeling, the internal reset request sources are from the aon_timer and the soc_proxy (translating soc external async request into an internal request.
A new top may have additional sources. Similarly a new top may re-order the connectivity vector.
The usage of the internal_reset_request vector in pwrmgr needs to be correlated with the top instantiation via templated code generation support