Post-Ratification Clarification: Dependency from Zkr to Zicsr

[a4lg]

The Zkr extension (Entropy Source Extension) defines its CSR seed.

My request is, as this fact suggests that the Zkr extension depends on the Zicsr extension, to clarify that the Zkr extension depends on the Zicsr extension.

1. Zicntr / Zihpm extensions (in the ISA Manual) have dependencies to Zicsr.
2. I requested some draft extensions to clarify that an extension with CSR depends on the Zicsr extension as follows:
   • Zjpm Proposal: Add dependency to Zicsr riscv-j-extension#17
   • Proposal: Add dependency to Zicsr riscv-cfi#14
3. I requested clarification to existing ratified specifications:
   • Post-Ratification Clarification: Dependency from Zkr to Zicsr #350 (Here)
   • Post-Ratification Clarification: Dependency from Zve32x to Zicsr riscvarchive/riscv-v-spec#908

[a4lg]

Ping.