$\Xi_c^0$ baryon production cross section in p–Pb collisions at $\sqrt{s_\mathrm{NN}}= 5.02$ TeV compared to the $\Xi_c^0$ production cross section in pp collisions at $\sqrt{s}= 5.02$ TeV (multiplied by $A_\mathrm{Pb}$) and to POWHEG + PYTHIA6 + EPPS16 nPDF and QCM predictions