irq-gic-v3-its: It can't be initialized when the GICR had been cut

ascend inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I554T5


CVE: NA

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In FPGA, We need to check if the gicr has been cut,
and if it is, it can't be initialized

Signed-off-by: Xu Qiang <xuqiang36@huawei.com>
Reviewed-by: Liao Chang <liaochang1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>