feat: add /proc/fs_cache to display cache info

add /proc/fs_cache to display vnode, path cache, page cache.
also change some bad virable name

close: #I3WESD

Signed-off-by: mucor <mucorwang@gmail.com>

kernel/base/include/los_vm_filemap.h

@@ -206,6 +206,9 @@ VOID OsMarkPageDirty(LosFilePage *fpage, LosVmMapRegion *region, int off, int le
 
 typedef struct ProcessCB LosProcessCB;
 VOID OsVmmFileRegionFree(struct file *filep, LosProcessCB *processCB);
+#ifdef LOSCFG_DEBUG_VERSION
+VOID ResetPageCacheHitInfo(int *try, int *hit);
+#endif
 #ifdef __cplusplus
 #if __cplusplus
 }