imx7: psci: save context id in cpu_on command

Replace the psci_save_target_pc call by the new function
psci_save(cpu, pc,context_id)
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>

arch/arm/mach-imx/mx7/psci.S

@@ -23,7 +23,8 @@ psci_cpu_on:
 	mov	r5, r1
 	mov	r0, r1
 	mov	r1, r2
-	bl	psci_save_target_pc
+	mov	r2, r3
+	bl	psci_save
 
 	mov	r0, r4
 	mov	r1, r5