x86/opcode: Add the LKGS instruction to x86-opcode-map

Add the instruction opcode used by LKGS to x86-opcode-map.

Opcode number is per public FRED draft spec v3.0.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230112072032.35626-3-xin3.li@intel.com