mips32r6: cpu emulation seems to have changed in qemu somehow

target/mips/Makefile

@@ -17,7 +17,7 @@ QEMU_ARGS+=${ADK_QEMU_ARGS}
 QEMU_ARGS+=-device e1000,netdev=adk0 -netdev user,id=adk0
 
 ifeq ($(ADK_TARGET_CPU_MIPS_MIPS32R6),y)
-QEMU_ARGS+=-cpu P5600
+QEMU_ARGS+=-cpu mips32r6-generic
 endif
 
 # target helper text