target/riscv: Remove check on RVH for riscv_cpu_set_virt_enabled

In current implementation, riscv_cpu_set_virt_enabled is only called when
RVH is enabled.

Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230327080858.39703-5-liweiwei@iscas.ac.cn>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu_helper.c

@@ -563,12 +563,9 @@ bool riscv_cpu_virt_enabled(CPURISCVState *env)
     return get_field(env->virt, VIRT_ONOFF);
 }
 
+/* This function can only be called to set virt when RVH is enabled */
 void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable)
 {
-    if (!riscv_has_ext(env, RVH)) {
-        return;
-    }
-
     /* Flush the TLB on all virt mode changes. */
     if (get_field(env->virt, VIRT_ONOFF) != enable) {
         tlb_flush(env_cpu(env));