target/riscv: Remove check on RVH for riscv_cpu_virt_enabled

Since env->virt.VIRT_ONOFF is initialized as false, and will not be set
to true when RVH is disabled, so we can just return this bit(false) when
RVH is not disabled.

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: <20230327080858.39703-4-liweiwei@iscas.ac.cn>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu_helper.c

@@ -560,10 +560,6 @@ void riscv_cpu_set_geilen(CPURISCVState *env, target_ulong geilen)
 
 bool riscv_cpu_virt_enabled(CPURISCVState *env)
 {
-    if (!riscv_has_ext(env, RVH)) {
-        return false;
-    }
-
     return get_field(env->virt, VIRT_ONOFF);
 }