target/loongarch/gdbstub: Add vector registers support

GDB already support LoongArch vector extension[1], QEMU gdb adds
LoongArch vector registers support, so that users can use 'info all-registers'

target/loongarch/gdbstub: Add vector registers support

GDB already support LoongArch vector extension[1], QEMU gdb adds
LoongArch vector registers support, so that users can use 'info all-registers'
to get all vector registers values.

[1]: https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=1e9569f383a3d5a88ee07d0c2401bd95613c222e

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewd-by: Bibo Mao <maobibo@loongson.cn>
Message-Id: <20240711024454.3075183-1-gaosong@loongson.cn>

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