Remove the namespacing from config-no-entropy.h

Remove the `mbedtls` namespacing from the `config-no-entropy.h` file,
as it is being imported to the include folder.
diff --git a/configs/config-no-entropy.h b/configs/config-no-entropy.h
index 68cde30..b4a0930 100644
--- a/configs/config-no-entropy.h
+++ b/configs/config-no-entropy.h
@@ -86,6 +86,6 @@
 /* Miscellaneous options */
 #define MBEDTLS_AES_ROM_TABLES
 
-#include "mbedtls/check_config.h"
+#include "check_config.h"
 
 #endif /* MBEDTLS_CONFIG_H */