project: msmzirc: Add macro for boot config

Boot config values differ for mdm platforms as nand
is the default nand device, add macro to differentiate
boot config for these platforms.

Change-Id: I9277a6752466aeb363200537edc429ed139c821b
diff --git a/project/msmzirc.mk b/project/msmzirc.mk
index f021b26..3cec784 100644
--- a/project/msmzirc.mk
+++ b/project/msmzirc.mk
@@ -18,6 +18,7 @@
 DEFINES += SPMI_CORE_V2=1
 DEFINES += BAM_V170=1
 DEFINES += USE_BOOTDEV_CMDLINE=1
+DEFINES += USE_MDM_BOOT_CFG=1
 
 ifeq ($(ENABLE_USB30_SUPPORT),1)
 DEFINES += USB30_SUPPORT=1