Fold interface-param struct-field generate condition (sub.CFG.HSK.DLY)

[alaindargelas]

Extends resolveInterfacePortMember to resolve a NESTED struct-parameter field read through an interface port, sub.CFG.HSK.DLY — where CFG is a struct parameter of the interface and .HSK.DLY walks its members. Previously only a direct 2-level sub.<localparam> was handled; a deeper path stayed a non-constant hier_path, so a generate condition if (sub.CFG.HSK.DLY == N) (or case (sub.CFG.BUS.MOD)) could not fold and the branch was dropped.

For a multi-level member the helper now builds a sub-path from the member elements (dropping the interface-port base) and decodes it via decodeHierPath in the interface DEFINITION's context, where the struct-parameter-field navigation resolves it to a constant. The interface instance is not bound to the port at generate-elaboration time, so the type-definition params (default/overridden) are used.

This drives the jeras/rp32 demultiplexer response select (rsp_sel, guarded by if (sub.CFG.HSK.DLY == 0/1)) and clears the EL0545 "Invalid generate case stmt value" on tcb_lite_lib_register_request's case (sub.CFG.BUS.MOD) — the degu SoC now elaborates without error.

New regression: tests/GenIfIfaceParamStructField. Full regression: 787 PASS, 0 fails.

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