SPM: Set features with config header file

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: Ie9dd99456a3ad8cb3d7601d484c0f396b201c448
diff --git a/config/config_base.h b/config/config_base.h
index ea9f3bc..ebe1e21 100644
--- a/config/config_base.h
+++ b/config/config_base.h
@@ -146,4 +146,12 @@
 /* The stack size of the Protected Storage Secure Partition */
 #define PS_STACK_SIZE                          0x700
 
+/* SPM Partition Configs */
+
+/* The maximal number of secure services that are connected or requested at the same time */
+#define CONFIG_TFM_CONN_HANDLE_MAX_NUM         8
+
+/* Enable the doorbell APIs */
+#define CONFIG_TFM_DOORBELL_API                1
+
 #endif /* __CONFIG_BASE_H__ */