xfs: rename xfs_sync.[ch] to xfs_icache.[ch]

xfs_sync.c now only contains inode reclaim functions and inode cache
iteration functions. It is not related to sync operations anymore.
Rename to xfs_icache.c to reflect it's contents and prepare for
consolidation with the other inode cache file that exists
(xfs_iget.c).

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index d2bf974..442f256 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -39,6 +39,7 @@
 				   xfs_fsops.o \
 				   xfs_fs_subr.o \
 				   xfs_globals.o \
+				   xfs_icache.o \
 				   xfs_iget.o \
 				   xfs_ioctl.o \
 				   xfs_iomap.o \
@@ -47,7 +48,6 @@
 				   xfs_message.o \
 				   xfs_mru_cache.o \
 				   xfs_super.o \
-				   xfs_sync.o \
 				   xfs_xattr.o \
 				   xfs_rename.o \
 				   xfs_utils.o \