cmd/internal/obj/riscv: implement Zicond assembly

[lxq015]

This patch implement assembler for the Zicond extension: CZEROEQZ and CZERONEZ.

Follow-up to CL 631576
Updates #75350

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Patch Set 1:

(1 comment)

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Patch Set 1:

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Message from Mark Ryan:

Patch Set 2:

(1 comment)

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Message from Meng Zhuo:

Patch Set 2:

(5 comments)

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Message from Xueqi Luo:

Patch Set 7:

(8 comments)

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