MIPS: Loongson: Add comments for interface_info

Clarify meanings of members of interface_info, especially for .size,
which does not define the ROM size.

Suggested-by: Icenowy Zheng <uwu@icenowy.me>
Signed-off-by: Kexy Biscuit <kexybiscuit@aosc.io>
Acked-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Author: KexyBiscuit

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

@@ -128,10 +128,10 @@ struct irq_source_routing_table {
 } __packed;
 
 struct interface_info {
-	u16 vers; /* version of the specificition */
-	u16 size;
-	u8  flag;
-	char description[64];
+	u16 vers; /* version of the specification */
+	u16 size; /* size of this interface */
+	u8  flag; /* used or unused */
+	char description[64]; /* description for each change */
 } __packed;
 
 #define MAX_RESOURCE_NUMBER 128