meta-ibm: p9-host-start: style fixes

Use typical bitbake metadata style and use double instead of single
quotes, and put the append operator prior to the override.

(From meta-ibm rev: 5670481726ee9e986090498e921f446ed61f1b84)

Change-Id: I744a54540b671b534f1eb1cac0a87e1891c782be
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-ibm/meta-witherspoon/recipes-phosphor/host/p9-host-start.bbappend b/meta-ibm/meta-witherspoon/recipes-phosphor/host/p9-host-start.bbappend
index 45deee5..0eee561 100644
--- a/meta-ibm/meta-witherspoon/recipes-phosphor/host/p9-host-start.bbappend
+++ b/meta-ibm/meta-witherspoon/recipes-phosphor/host/p9-host-start.bbappend
@@ -1,4 +1,4 @@
-RDEPENDS_${PN}_witherspoon_append = ' avsbus-control'
-RDEPENDS_${PN}_witherspoon_append = ' vrm-control'
-RDEPENDS_${PN}_append = ' power-workarounds'
+RDEPENDS_${PN}_append_witherspoon = " avsbus-control"
+RDEPENDS_${PN}_append_witherspoon = " vrm-control"
+RDEPENDS_${PN}_append = " power-workarounds"
 RDEPENDS_${PN}_remove += "p9-vcs-workaround"