meta-lenovo: hr855xg2: flash: update bbappend

Update the configuration options to leverage the now available
PACKAGECONFIG options.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I65ec56d665e878a215c015fa94feaf38c649fc4f
diff --git a/meta-hr855xg2/recipes-phosphor/ipmi/phosphor-ipmi-flash_%.bbappend b/meta-hr855xg2/recipes-phosphor/ipmi/phosphor-ipmi-flash_%.bbappend
index 01549f5..5852506 100644
--- a/meta-hr855xg2/recipes-phosphor/ipmi/phosphor-ipmi-flash_%.bbappend
+++ b/meta-hr855xg2/recipes-phosphor/ipmi/phosphor-ipmi-flash_%.bbappend
@@ -1,7 +1,7 @@
 #"Copyright (c) 2019-present Lenovo
 #Licensed under BSD-3, see COPYING.BSD file for details."
 
-FILESEXTRAPATHS_prepend_hr855xg2 := "${THISDIR}/${PN}:"
-EXTRA_OECONF_append_hr855xg2 = " --enable-static-layout --enable-lpc-bridge --enable-aspeed-lpc --enable-reboot-update"
-
+PACKAGECONFIG_append_hr855xg2 = " static-bmc"
+PACKAGECONFIG_append_hr855xg2 = " aspeed-lpc"
+PACKAGECONFIG_append_hr855xg2 = " reboot-update"
 IPMI_FLASH_BMC_ADDRESS_hr855xg2 = "0x98000000"