meta-ampere: adjust phosphor-ipmi-host PACKAGECONFIG

The bbappend was previously defining a PACKAGECONFIG but that
PACKAGECONFIG was already defined in the base recipe.  I suspect
the intention was to _enable_ the existing PACKAGECONFIG.  Adjust
accordingly.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9f88451454fc1de8b6bb43caa3657c65cafd3b0d
diff --git a/meta-ampere/meta-common/recipes-phosphor/ipmi/phosphor-ipmi-host_%.bbappend b/meta-ampere/meta-common/recipes-phosphor/ipmi/phosphor-ipmi-host_%.bbappend
index ae4a2df..f7d3071 100644
--- a/meta-ampere/meta-common/recipes-phosphor/ipmi/phosphor-ipmi-host_%.bbappend
+++ b/meta-ampere/meta-common/recipes-phosphor/ipmi/phosphor-ipmi-host_%.bbappend
@@ -3,7 +3,7 @@
 RRECOMMENDS:${PN} += "ipmitool"
 RDEPENDS:${PN} += "bash"
 
-PACKAGECONFIG[dynamic-sensors] = "--enable-dynamic-sensors"
+PACKAGECONFIG:append = " dynamic-sensors"
 HOSTIPMI_PROVIDER_LIBRARY += "libdynamiccmds.so"
 
 SRC_URI += "\