ksm: add the ksm prefix to the names of the ksm private structures

ksm: add the ksm prefix to the names of the ksm private structures

In order to prevent the name of the private structure of ksm from being
the same as the name of the common structure used in subsequent patches,
prefix their names with ksm in advance.

Link: https://lkml.kernel.org/r/20220831031951.43152-5-zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>