RISC-V: Implement ZKSH and ZKSED extensions

This patch supports Zksh and Zksed extension.
It includes instruction's machine description and built-in funtions.

gcc/ChangeLog:

	* config/riscv/crypto.md (riscv_sm3p0_<mode>): Add ZKSED's and ZKSH's
	instructions.
	(riscv_sm3p1_<mode>): New.
	(riscv_sm4ed_<mode>): New.
	(riscv_sm4ks_<mode>): New.
	* config/riscv/riscv-builtins.cc (AVAIL): Add ZKSED's and ZKSH's AVAIL.
	* config/riscv/riscv-scalar-crypto.def (RISCV_BUILTIN): Add ZKSED's and
	ZKSH's built-in functions.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zksed32.c: New test.
	* gcc.target/riscv/zksed64.c: New test.
	* gcc.target/riscv/zksh32.c: New test.
	* gcc.target/riscv/zksh64.c: New test.

Co-Authored-By: SiYu Wu <siyu@isrc.iscas.ac.cn>