RFR: 8293840: RISC-V: Remove cbuf parameter from far_call/far_jump/trampoline_call

[Feilong Jiang]

Follow up [JDK-8287394](https://bugs.openjdk.org/browse/JDK-8287394), remove cbuf parameter from far_call/far_jump/trampoline in riscv.


Testing:
- Tier1 passed on unmatched board with release build

-------------

Commit messages:
 - Remove cbuf parameter from far_call/far_jump/trampoline_call

Changes: https://git.openjdk.org/jdk/pull/10277/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10277&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293840
  Stats: 19 lines in 4 files changed: 1 ins; 4 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/10277.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10277/head:pull/10277

PR: https://git.openjdk.org/jdk/pull/10277