[Feature] riscv进行上下文切换的时候是否需要内存屏障fence指令呢？

### Affected area

Kernel

### Hardware/BSP vendor

Not applicable / Other

### Architecture

RISC-V

### Describe problem solved by the proposed feature

riscv进行上下文切换的时候是否需要内存屏障fence指令呢？

### Describe your preferred solution

_No response_

### Describe possible alternatives

_No response_