Support unroll of cluster for csfr peripherals

[AthiraRamakrishna]

Is your feature request related to a problem? Please describe.

For the core registers the address in stored as type (pub struct RegCore<T: RegSpec, A: Access, const ADDR: u16> ) therefore we need to unroll the cluster registers within the csfr peripherals(CPUx).
Applicable only for the aurix targets.

Describe the solution you'd like
Extend the templates to support the unroll of clusters specific to csfr only.

Example :
All registers within CPU DPR[%s] cluster will be unrolled to separate register instances.