openpower: Fix _appends with missing space

These _appends can potentially crowd their neighboring entries.

Change-Id: I1dae77f9a17744110175916935c01773708652b0
Tested: Built a witherspoon image
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-firestone/conf/machine/firestone.conf b/meta-firestone/conf/machine/firestone.conf
index 34abe31..7035ec2 100644
--- a/meta-firestone/conf/machine/firestone.conf
+++ b/meta-firestone/conf/machine/firestone.conf
@@ -12,7 +12,7 @@
 
 FLASH_SIZE = "32768"
 
-DISTRO_FEATURES_append = "\
+DISTRO_FEATURES_append = " \
         obmc-openpower \
         obmc-openpower-extra \
         obmc-openpower-legacy \