fsdax: don't require CONFIG_BLOCK

The file system DAX code now does not require the block code.  So allow
building a kernel with fuse DAX but not block layer.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20211129102203.2243509-30-hch@lst.deSigned-off-by: Dan Williams <dan.j.williams@intel.com>

fs/Kconfig

@@ -42,6 +42,8 @@ source "fs/nilfs2/Kconfig"
 source "fs/f2fs/Kconfig"
 source "fs/zonefs/Kconfig"
 
+endif # BLOCK
+
 config FS_DAX
 	bool "File system based Direct Access (DAX) support"
 	depends on MMU
@@ -89,8 +91,6 @@ config FS_DAX_PMD
 config FS_DAX_LIMITED
 	bool
 
-endif # BLOCK
-
 # Posix ACL utility routines
 #
 # Note: Posix ACLs can be implemented without these helpers.  Never use