arm64/mpam: remove __init macro to support driver probe

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4L735


CVE: NA

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To support device tree boot for arm64 mpam, the __init macro might be
used by the dts driver. This remove the necessary __init macro for the
related functions.

Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Reviewed-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>