[HW] hw-flatten-modules doesn't work with parameters

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```mlir
hw.module private @parameters(out out: i42) {
%result = hw.param.value i42 = #hw.param.decl.ref<"p1">
hw.output %result: i42
}

hw.module @UseParameterized(out x: i42, out y: i42, out z: i42) {
%r0 = hw.instance "inst1" @parameters() -> (out: i42)
%r1 = hw.instance "inst2" @parameters() -> (out: i42)
%r2 = hw.instance "inst3" @parameters() -> (out: i42)
hw.output %r0, %r1, %r2: i42, i42, i42
}

$ circt-opt -hw-flatten-modules bar.mlir -mlir-print-ir-after-all

// -----// IR Dump After FlattenModules Failed (hw-flatten-modules) //----- //
#loc = loc("bar.mlir":6:33)
#loc1 = loc("bar.mlir":6:45)
#loc2 = loc("bar.mlir":6:57)
"builtin.module"() ({
"hw.module"() <{module_type = !hw.modty, parameters = [], result_locs = [#loc, #loc1, #loc2], sym_name = "UseParameterized"}> ({
%0 = "hw.param.value"() <{value = #hw.param.decl.ref<"p1"> : i42}> : () -> i42
%1 = "hw.param.value"() <{value = #hw.param.decl.ref<"p1"> : i42}> : () -> i42
%2 = "hw.param.value"() <{value = #hw.param.decl.ref<"p1"> : i42}> : () -> i42
"hw.output"(%0, %1, %2) : (i42, i42, i42) -> ()
}) : () -> ()
}) : () -> ()
```

Start with the provided bar.mlir reproducer and run circt-opt with hw-flatten-modules and -mlir-print-ir-after-all. Trace how the pass handles hw.instance parameters and hw.param.value operations; done means flattening UseParameterized preserves the three instance parameter values instead of leaving unresolved p1 references.

Written by the indexing model from the issue text.