s390: Provide IBM z16 (arch14) instruction descriptions

Provide descriptions for instructions introduced with commit ba2b480f
("IBM Z: Implement instruction set extensions"). This complements commit
69341966 ("IBM zSystems: Add support for z16 as CPU name."). Use
instruction names from IBM z/Architecture Principles of Operation [1] as
instruction description.

[1]: IBM z/Architecture Principles of Operation, SA22-7832-13, IBM z16,
     https://publibfp.dhe.ibm.com/epubs/pdf/a227832d.pdf



opcodes/
	* s390-opc.txt: Add descriptions for IBM z16 (arch14)
	  instructions.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Reviewed-by: Andreas Krebbel <krebbel@linux.ibm.com>