package/mtd: fix tests compiling when disabled

Upstream changed the '--enable-tests' switch to '--with-tests' in
release 2.2.0

See edc83b6174

Fixes:
- http://autobuild.buildroot.net/results/52a289c7033005b7a29b0f2bc6aa5056cbdabb34/

Signed-off-by: Brandon Maier <brandon.maier@collins.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/mtd/mtd.mk

@@ -56,9 +56,9 @@ MTD_CONF_OPTS += --disable-ubihealthd
 endif
 
 ifeq ($(BR2_PACKAGE_MTD_TESTS),y)
-MTD_CONF_OPTS += --enable-tests
+MTD_CONF_OPTS += --with-tests
 else
-MTD_CONF_OPTS += --disable-tests
+MTD_CONF_OPTS += --without-tests
 endif
 
 # If extended attributes are required, the acl package must
@@ -75,7 +75,7 @@ HOST_MTD_CONF_OPTS = \
 	--with-jffs \
 	--with-ubifs \
 	--without-crypto \
-	--disable-tests
+	--without-tests
 
 MKFS_JFFS2 = $(HOST_DIR)/sbin/mkfs.jffs2
 SUMTOOL = $(HOST_DIR)/sbin/sumtool