MIPS: Loongson fix name confict - MEM_RESERVED

MEM_RESERVED is used as a value of enum mem_type in include/linux/
edac.h. This will make failure to build for Loongson in some case:
for example with CONFIG_RAS enabled.

So here rename MEM_RESERVED to SYSTEM_RAM_RESERVED in Loongson code.
Signed-off-by: YunQiang Su <yunqiang.su@imgtec.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Reviewed-by: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17724/Signed-off-by: James Hogan <jhogan@kernel.org>

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

@@ -4,7 +4,7 @@
 
 #define SYSTEM_RAM_LOW		1
 #define SYSTEM_RAM_HIGH		2
-#define MEM_RESERVED		3
+#define SYSTEM_RAM_RESERVED	3
 #define PCI_IO			4
 #define PCI_MEM			5
 #define LOONGSON_CFG_REG	6

arch/mips/loongson64/common/mem.c

@@ -79,7 +79,7 @@ void __init prom_init_memory(void)
 					(u64)loongson_memmap->map[i].mem_size << 20,
 					BOOT_MEM_RAM);
 				break;
-			case MEM_RESERVED:
+			case SYSTEM_RAM_RESERVED:
 				add_memory_region(loongson_memmap->map[i].mem_start,
 					(u64)loongson_memmap->map[i].mem_size << 20,
 					BOOT_MEM_RESERVED);

arch/mips/loongson64/loongson-3/numa.c

@@ -166,7 +166,7 @@ static void __init szmem(unsigned int node)
 			memblock_add_node(PFN_PHYS(start_pfn),
 				PFN_PHYS(end_pfn - start_pfn), node);
 			break;
-		case MEM_RESERVED:
+		case SYSTEM_RAM_RESERVED:
 			pr_info("Node%d: mem_type:%d, mem_start:0x%llx, mem_size:0x%llx MB\n",
 				(u32)node_id, mem_type, mem_start, mem_size);
 			add_memory_region((node_id << 44) + mem_start,