ore: Make ore its own module

Export everything from ore need exporting. Change Kbuild and Kconfig
to build ore.ko as an independent module. Import ore from exofs

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
diff --git a/fs/exofs/Kconfig b/fs/exofs/Kconfig
index 86194b2..70bae41 100644
--- a/fs/exofs/Kconfig
+++ b/fs/exofs/Kconfig
@@ -1,6 +1,10 @@
+config ORE
+	tristate
+
 config EXOFS_FS
 	tristate "exofs: OSD based file system support"
 	depends on SCSI_OSD_ULD
+	select ORE
 	help
 	  EXOFS is a file system that uses an OSD storage device,
 	  as its backing storage.