perf: Remove unused extern declaration arch_perf_get_page_size()
commit 8af26be0 ("perf/core: Fix arch_perf_get_page_size()") left behind this. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20230725135038.25060-1-yuehaibing@huawei.com
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0cb52ad7
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