quota: Move quota files into separate directory

Quota subsystem has more and more files. It's time to create a dir for it.

Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/quota/Makefile b/fs/quota/Makefile
new file mode 100644
index 0000000..385a083
--- /dev/null
+++ b/fs/quota/Makefile
@@ -0,0 +1,14 @@
+#
+# Makefile for the Linux filesystems.
+#
+# 14 Sep 2000, Christoph Hellwig <hch@infradead.org>
+# Rewritten to use lists instead of if-statements.
+#
+
+obj-y :=
+
+obj-$(CONFIG_QUOTA)		+= dquot.o
+obj-$(CONFIG_QFMT_V1)		+= quota_v1.o
+obj-$(CONFIG_QFMT_V2)		+= quota_v2.o
+obj-$(CONFIG_QUOTA_TREE)	+= quota_tree.o
+obj-$(CONFIG_QUOTACTL)		+= quota.o