Revert "f2fs: use timespec64 for inode timestamps"

This reverts commit 677f89e0188fe625eb1864f353536696c3890f6d.

This is to fix build errors for mips.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index bdbecb9..606b1cf 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -686,8 +686,8 @@
 	int i_extra_isize;		/* size of extra space located in i_addr */
 	kprojid_t i_projid;		/* id for project quota */
 	int i_inline_xattr_size;	/* inline xattr size */
-	struct timespec64 i_crtime;	/* inode creation time */
-	struct timespec64 i_disk_time[4];/* inode disk times */
+	struct timespec i_crtime;	/* inode creation time */
+	struct timespec i_disk_time[4];	/* inode disk times */
 };
 
 static inline void get_extent_info(struct extent_info *ext,
@@ -2570,13 +2570,13 @@
 			i_size_read(inode) & ~PAGE_MASK)
 		return false;
 
-	if (!timespec64_equal(F2FS_I(inode)->i_disk_time, &inode->i_atime))
+	if (!timespec_equal(F2FS_I(inode)->i_disk_time, &inode->i_atime))
 		return false;
-	if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 1, &inode->i_ctime))
+	if (!timespec_equal(F2FS_I(inode)->i_disk_time + 1, &inode->i_ctime))
 		return false;
-	if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 2, &inode->i_mtime))
+	if (!timespec_equal(F2FS_I(inode)->i_disk_time + 2, &inode->i_mtime))
 		return false;
-	if (!timespec64_equal(F2FS_I(inode)->i_disk_time + 3,
+	if (!timespec_equal(F2FS_I(inode)->i_disk_time + 3,
 						&F2FS_I(inode)->i_crtime))
 		return false;