target: init: Add API to check target supports dtbo

Add API to determine if DTBO is supported for target,
This is needed by avb for dtbo image validation.

Change-Id: Ie84ad026da1fea9ac2e4548b454f0878735a0ab5
diff --git a/include/target.h b/include/target.h
index 52543ef..14c86db 100644
--- a/include/target.h
+++ b/include/target.h
@@ -105,6 +105,7 @@
 int target_get_qmp_regsize();
 uint32_t target_ddr_cfg_reg();
 
+bool is_target_support_dtbo(void);
 bool target_is_pmi_enabled(void);
 #if PON_VIB_SUPPORT
 void get_vibration_type();