Analytical modeling of 2DEG and 2DHG charge balancing in quaternary $$\hbox {Al}_{0.42}\hbox {In}_{0.03}\hbox {Ga}_{0.55}\hbox {N/Al}_{0.3}\hbox {In}_{0.7}\hbox {N}$$Al0.42In0.03Ga0.55N/Al0.3In0.7N HEMTs