If any provision of this part and the 1968 amendments to [former] § 67-5-1101 [repealed] and § 67-2-104 or the application thereof to any person or circumstance is held invalid, such provision shall not be severable from this part and the 1968 amendments to [former] § 67-5-1101 [repealed] and § 67-2-104 and the whole of such provisions shall fail and be inoperative.