KABI: reserve space for struct input_dev

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QWCF


CVE: NA

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Reserving some fields in struct input_dev for future development.

Signed-off-by: Chen Jiahao <chenjiahao16@huawei.com>
Reviewed-by: Liao Chang <liaochang1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>