RISC-V: Add T-Head MAC vendor extension

T-Head has a range of vendor-specific instructions.
Therefore it makes sense to group them into smaller chunks
in form of vendor extensions.

This patch adds the XTheadMac extension, a collection of
T-Head-specific multiply-accumulate instructions.
The 'th' prefix and the "XTheadMac" extension are documented
in a PR for the RISC-V toolchain conventions ([1]).

[1] https://github.com/riscv-non-isa/riscv-toolchain-conventions/pull/19

Co-developed-by: Lifang Xia <lifang_xia@linux.alibaba.com>
Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

include/opcode/riscv.h

@@ -420,6 +420,7 @@ enum riscv_insn_class
   INSN_CLASS_XTHEADBS,
   INSN_CLASS_XTHEADCMO,
   INSN_CLASS_XTHEADCONDMOV,
+  INSN_CLASS_XTHEADMAC,
   INSN_CLASS_XTHEADSYNC,
 };