mvebu: only disable WRT1900AC v1 and WRT32X for buildbots

Use "DEFAULT := n" to only disable devices for buildbots, but
keep them available for manual build.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/mvebu/image/cortexa9.mk

@@ -108,8 +108,9 @@ define Device/linksys_wrt1900ac-v1
   DEVICE_DTS := armada-xp-linksys-mamba
   DEVICE_PACKAGES += mwlwifi-firmware-88w8864
   KERNEL_SIZE := 3072k
+  DEFAULT := n
 endef
-#TARGET_DEVICES += linksys_wrt1900ac-v1
+TARGET_DEVICES += linksys_wrt1900ac-v1
 
 define Device/linksys_wrt1900ac-v2
   $(call Device/linksys)
@@ -141,8 +142,9 @@ define Device/linksys_wrt32x
   DEVICE_PACKAGES += kmod-btmrvl kmod-mwifiex-sdio mwlwifi-firmware-88w8964
   KERNEL_SIZE := 3072k
   KERNEL := kernel-bin | append-dtb
+  DEFAULT := n
 endef
-#TARGET_DEVICES += linksys_wrt32x
+TARGET_DEVICES += linksys_wrt32x
 
 define Device/marvell_a370-db
   $(Device/NAND-512K)