RISC-V: Scalar crypto instruction and entropy source CSR testcases.

RISC-V: Scalar crypto instruction and entropy source CSR testcases.

Add testcases for Scalar Crypto extension, with total testcase contain all
instructions in k-ext/k-ext-64 and sub-extension testcase for zbk* zk*. Also
add testcase for new CSR name 'seed' which is the Entropy Source in zkr.

In fact these whole testcases can be combined into one file, after we have
supported the .option arch +-= directives.

gas/
	* testsuite/gas/riscv/k-ext-64.d: New testcase for crypto instructions.
	* testsuite/gas/riscv/k-ext-64.s: Likewise.
	* testsuite/gas/riscv/k-ext.d: Likewise.
	* testsuite/gas/riscv/k-ext.s: Likewise.
	* testsuite/gas/riscv/zbkb-32.d: Likewise.
	* testsuite/gas/riscv/zbkb-32.s: Likewise.
	* testsuite/gas/riscv/zbkb-64.d: Likewise.
	* testsuite/gas/riscv/zbkb-64.s: Likewise.
	* testsuite/gas/riscv/zbkc-32.d: Likewise.
	* testsuite/gas/riscv/zbkc-64.d: Likewise.
	* testsuite/gas/riscv/zbkc.s: Likewise.
	* testsuite/gas/riscv/zbkx-32.d: Likewise.
	* testsuite/gas/riscv/zbkx-64.d: Likewise.
	* testsuite/gas/riscv/zbkx.s: Likewise.
	* testsuite/gas/riscv/zknd-32.d: Likewise.
	* testsuite/gas/riscv/zknd-32.s: Likewise.
	* testsuite/gas/riscv/zknd-64.d: Likewise.
	* testsuite/gas/riscv/zknd-64.s: Likewise.
	* testsuite/gas/riscv/zkne-32.d: Likewise.
	* testsuite/gas/riscv/zkne-32.s: Likewise.
	* testsuite/gas/riscv/zkne-64.d: Likewise.
	* testsuite/gas/riscv/zkne-64.s: Likewise.
	* testsuite/gas/riscv/zknh-32.d: Likewise.
	* testsuite/gas/riscv/zknh-32.s: Likewise.
	* testsuite/gas/riscv/zknh-64.d: Likewise.
	* testsuite/gas/riscv/zknh-64.s: Likewise.
	* testsuite/gas/riscv/zksed-32.d: Likewise.
	* testsuite/gas/riscv/zksed-64.d: Likewise.
	* testsuite/gas/riscv/zksed.s: Likewise.
	* testsuite/gas/riscv/zksh-32.d: Likewise.
	* testsuite/gas/riscv/zksh-64.d: Likewise.
	* testsuite/gas/riscv/zksh.s: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-zkr.d: New testcase for zkr
	csr check.
	* testsuite/gas/riscv/priv-reg-fail-zkr.l: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-version-1p10.d: Updated march to
	rv32if_zkr.
	* testsuite/gas/riscv/priv-reg-fail-version-1p11.d: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-version-1p9p1.d: Likewise.
	* testsuite/gas/riscv/priv-reg-version-1p10.d: Added Crypto seed csr.
	* testsuite/gas/riscv/priv-reg-version-1p11.d: Likewise.
	* testsuite/gas/riscv/priv-reg-version-1p9p1.d: Likewise.
	* testsuite/gas/riscv/priv-reg.s: Likewise.