[AMDGPU][GIsel] Legalize rules for cvt_scalef32_sr_pk_fp4_{f16,f32} intrinsic (#193176)
Add RegBankLegalize rules for- - amdgcn_cvt_scalef32_sr_pk_fp4_f16
- amdgcn_cvt_scalef32_sr_pk_fp4_f32
Update the existing test case _llvm.amdgcn.cvt.scalef32.sr.pk.gfx950.ll_
to use -new-reg-bank-select flag.