Remove unnecessary include directory from CMake

Since psa_crypto.c does not include tests/include/test/memory.h, we do
not need the tests/include include path.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 52178e4..5c297e0 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -329,8 +329,7 @@
                $<INSTALL_INTERFACE:include/>
         PRIVATE ${MBEDTLS_DIR}/library/
                 # Needed to include psa_crypto_driver_wrappers.h
-                ${CMAKE_CURRENT_BINARY_DIR}
-                ${MBEDTLS_DIR}/tests/include/)
+                ${CMAKE_CURRENT_BINARY_DIR})
     # Pass-through MBEDTLS_CONFIG_FILE and MBEDTLS_USER_CONFIG_FILE
     if(MBEDTLS_CONFIG_FILE)
         target_compile_definitions(${target}