Workaround for insufficient heap on IAR+MTB_xDOT_GT

We currently don't have a mechanism for selecting tests based on the
available ram/heap, so the best solution right now is to disable these
tests specifically for this target.

features/TESTS/filesystem/heap_block_device/main.cpp

@@ -23,6 +23,11 @@
 
 using namespace utest::v1;
 
+// TODO HACK, replace with available ram/heap property
+#if defined(TARGET_MTB_MTS_XDOT)
+    #error [NOT_SUPPORTED] Insufficient heap for heap block device tests
+#endif
+
 #define TEST_BLOCK_SIZE 128
 #define TEST_BLOCK_DEVICE_SIZE 32*TEST_BLOCK_SIZE
 #define TEST_BLOCK_COUNT 10

features/TESTS/filesystem/mbr_block_device/main.cpp

@@ -24,6 +24,11 @@
 
 using namespace utest::v1;
 
+// TODO HACK, replace with available ram/heap property
+#if defined(TARGET_MTB_MTS_XDOT)
+    #error [NOT_SUPPORTED] Insufficient heap for heap block device tests
+#endif
+
 #define BLOCK_COUNT 16
 #define BLOCK_SIZE 512
 

features/TESTS/filesystem/util_block_device/main.cpp

@@ -26,6 +26,11 @@
 
 using namespace utest::v1;
 
+// TODO HACK, replace with available ram/heap property
+#if defined(TARGET_MTB_MTS_XDOT)
+    #error [NOT_SUPPORTED] Insufficient heap for heap block device tests
+#endif
+
 #define BLOCK_COUNT 16
 #define BLOCK_SIZE 512