[AMDGPU][True16] Support V_CEIL_F16. (#73108)

As not all fake instructions have their real counterparts implemented
yet, we specify no AssemblerPredicate for UseFakeTrue16Insts to allow
both fake and real True16 instructions in assembler and disassembler
tests in the -mattr=+real-true16 mode during the transition period.

Source DPP and desitnation VOPDstOperand_t16 operands are still not
supported and will be addressed separately.