RISC-V: Add T-Head Bitmanip 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 XThead{Ba,Bb,Bs} extensions, a collection of
T-Head-specific bitmanipulation instructions.
The 'th' prefix and the "XThead{Ba,Bb,Bs}" 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>