arm64: mark all the GICC nodes in MADT as possible cpu

hulk inclusion
category: feature
bugzilla: 20208
CVE: NA
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We set 'cpu_possible_mask' based on the enabled GICC node in MADT. If
the GICC node is disabled, we will skip initializing the kernel data
structure for that CPU.

To support CPU hotplug, we need to initialize some CPU related data
structure in advance. This patch mark all the GICC nodes as possible CPU
and only these enabled GICC nodes as present CPU.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Acked-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>