[source] orion: Make sub-targets augment FEATURES, not re-define it

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/3ca46aa25771556053bef9a6ae718357b5e8cbc0

commit 3ca46aa25771556053bef9a6ae718357b5e8cbc0
Author: Florian Fainelli <f.fainelli at gmail.com>
AuthorDate: Tue Nov 29 17:09:59 2016 -0800

    orion: Make sub-targets augment FEATURES, not re-define it
    
    Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 target/linux/orion/generic/target.mk  | 2 +-
 target/linux/orion/harddisk/target.mk | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/linux/orion/generic/target.mk b/target/linux/orion/generic/target.mk
index 451de4e..7b054ed 100644
--- a/target/linux/orion/generic/target.mk
+++ b/target/linux/orion/generic/target.mk
@@ -6,7 +6,7 @@
 #
 
 BOARDNAME:=Generic
-FEATURES:=squashfs
+FEATURES+=squashfs
 
 define Target/Description
 	Build firmware images for Marvell Orion based boards that boot from internal flash.
diff --git a/target/linux/orion/harddisk/target.mk b/target/linux/orion/harddisk/target.mk
index a3a0e41..b37c48a 100644
--- a/target/linux/orion/harddisk/target.mk
+++ b/target/linux/orion/harddisk/target.mk
@@ -6,7 +6,7 @@
 #
 
 BOARDNAME:=Internal Hard-Disk
-FEATURES:=targz
+FEATURES+=targz
 
 define Target/Description
 	Build firmware images for Marvell Orion based boards that boot directly from internal disk storage.