busybox: switch SRC_URI to single-append style

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I494bb2352ba068f02dab761fabc7cfcae6a70eb9
diff --git a/meta-phosphor/recipes-core/busybox/busybox_%.bbappend b/meta-phosphor/recipes-core/busybox/busybox_%.bbappend
index a64c144..f8800b4 100644
--- a/meta-phosphor/recipes-core/busybox/busybox_%.bbappend
+++ b/meta-phosphor/recipes-core/busybox/busybox_%.bbappend
@@ -1,6 +1,9 @@
 FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
-SRC_URI += "file://busybox.cfg"
-SRC_URI += "file://flash.cfg"
-SRC_URI += "file://less.cfg"
-SRC_URI += "file://mountpoint.cfg"
-SRC_URI += "${@bb.utils.contains('DISTRO_FEATURES', 'obmc-ubi-fs', '', 'file://reboot.cfg', d)}"
+SRC_URI += " \
+    file://busybox.cfg \
+    file://flash.cfg \
+    file://less.cfg \
+    file://mountpoint.cfg \
+    ${@bb.utils.contains('DISTRO_FEATURES', 'obmc-ubi-fs', \
+                         '', 'file://reboot.cfg', d)} \
+"