elf.h: add NT_ARM_TAGGED_ADDR_CTRL from linux v5.10

see

  linux commit 2200aa7154cb7ef76bac93e98326883ba64bfa2e
  arm64: mte: ptrace: Add NT_ARM_TAGGED_ADDR_CTRL regset

include/elf.h

@@ -686,6 +686,7 @@ typedef struct {
 #define NT_ARM_PAC_MASK	0x406
 #define NT_ARM_PACA_KEYS	0x407
 #define NT_ARM_PACG_KEYS	0x408
+#define NT_ARM_TAGGED_ADDR_CTRL	0x409
 #define NT_METAG_CBUF	0x500
 #define NT_METAG_RPIPE	0x501
 #define NT_METAG_TLS	0x502