MIPS: NUMA: Remove the unused parent_node() macro

Commit a7be6e5a7f8d ("mm: drop useless local parameters of
__register_one_node()") removes the last user of parent_node().

The parent_node() macros in both IP27 and Loongson64 are unnecessary.

Remove it for cleanup.

Reported-by: Michael Ellerman <[e-mail]>
Signed-off-by: Dou Liyang <[e-mail]>
Cc: James Hogan <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/16873/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/include/asm/mach-ip27/topology.h

···
 extern struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
 
 #define cpu_to_node(cpu)	(sn_cpu_info[(cpu)].p_nodeid)
-#define parent_node(node)	(node)
 #define cpumask_of_node(node)	((node) == -1 ?				\
 				 cpu_all_mask :				\
 				 &hub_data(node)->h_cpus)

arch/mips/include/asm/mach-loongson64/topology.h

···
 #ifdef CONFIG_NUMA
 
 #define cpu_to_node(cpu)	(cpu_logical_map(cpu) >> 2)
-#define parent_node(node)	(node)
 #define cpumask_of_node(node)	(&__node_data[(node)]->cpumask)
 
 struct pci_bus;