test_mbedtls: exclude platforms with insufficient RAM/ROM

This will un-break the daily build.

Change-Id: I516ddab4a905d51fb1fd59f7fa009df3511c7076
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
diff --git a/tests/crypto/test_mbedtls/testcase.ini b/tests/crypto/test_mbedtls/testcase.ini
index c6c965d..0b34df9 100644
--- a/tests/crypto/test_mbedtls/testcase.ini
+++ b/tests/crypto/test_mbedtls/testcase.ini
@@ -1,5 +1,6 @@
 [test]
 tags = crypto mbedtls
-platform_exclude = qemu_nios2
+# insufficient flash space on these devices
+platform_exclude = qemu_nios2 quark_d2000_crb olimexino_stm32 nucleo_f103rb
 build_only = false
 kernel = nano