cpuidle-haltpoll: Use arch_cpu_idle() to replace default_idle()

hulk inclusion
category: feature
bugzilla: 47727
CVE: NA

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Use arch_cpu_idle() to replace default_idle() in default_enter_idle().
default_idle() is defined only in x86.

Signed-off-by: Xiangyou Xie <xiexiangyou@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>