meta-lenovo: hr855xg2: ipmi-flash use mapped addr var

Use the IPMI_FLASH_BMC_ADDRESS mapped address variable to configure the
mapped_address configuration option.

(From meta-lenovo rev: 011afb2278f83d4038d42eb4ff0ec10ef8a02932)

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: If614065d3022b1868c93a62fd975322f4db68237
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-lenovo/meta-hr855xg2/recipes-phosphor/ipmi/phosphor-ipmi-flash_%.bbappend b/meta-lenovo/meta-hr855xg2/recipes-phosphor/ipmi/phosphor-ipmi-flash_%.bbappend
index 229e26d..01549f5 100644
--- a/meta-lenovo/meta-hr855xg2/recipes-phosphor/ipmi/phosphor-ipmi-flash_%.bbappend
+++ b/meta-lenovo/meta-hr855xg2/recipes-phosphor/ipmi/phosphor-ipmi-flash_%.bbappend
@@ -2,4 +2,6 @@
 #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 MAPPED_ADDRESS=0x98000000"
+EXTRA_OECONF_append_hr855xg2 = " --enable-static-layout --enable-lpc-bridge --enable-aspeed-lpc --enable-reboot-update"
+
+IPMI_FLASH_BMC_ADDRESS_hr855xg2 = "0x98000000"