Build: Add SPM log support for platforms

As SPM log functions have implemented, add SPM log support for
all the platforms. Set default TFM_SPM_LOG_LEVEL equal to
TFM_SPM_LOG_LEVEL_INFO.

Change-Id: I4111a9ac3840497a70302bbddb19605f8feafe08
Signed-off-by: Shawn Shan <Shawn.Shan@arm.com>
diff --git a/config/config_default.cmake b/config/config_default.cmake
index afa0922..952ed40 100644
--- a/config/config_default.cmake
+++ b/config/config_default.cmake
@@ -22,6 +22,8 @@
 set(TFM_EXTRA_MANIFEST_LIST_PATH        ""          CACHE PATH      "Path to extra manifest file, used to declare extra partitions. Appended to standard TFM manifest")
 set(TFM_EXTRA_GENERATED_FILE_LIST_PATH  ""          CACHE PATH      "Path to extra generated file list. Appended to stardard TFM generated file list.")
 
+set(TFM_SPM_LOG_LEVEL                   2           CACHE STRING    "Set SPM log level as INFO level")
+
 ########################## BL2 #################################################
 
 set(MCUBOOT_IMAGE_NUMBER                2           CACHE STRING    "Whether to combine S and NS into either 1 image, or sign each seperately")