[riscv-port] RFR: 8282466: riscv: Remove unused code in linux_riscv

[Fei Yang]

On Tue, 1 Mar 2022 03:07:23 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

> This PR has the following changes:
> 
> - Remove unused code in linux_riscv
> - More renaming from riscv64 to riscv in riscv backend
> 
> Hotspot and jdk tier1 tests on QEMU are passed without new failures.

Looks good. Thanks for the cleanup.

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Marked as reviewed by fyang (Lead).

PR: https://git.openjdk.java.net/riscv-port/pull/62