Move entropy_poll.h to library
`entropy_poll.h` is not supposed to be used by application code and
is therefore being made internal.
Signed-off-by: Chris Jones <christopher.jones@arm.com>
diff --git a/tests/suites/test_suite_entropy.function b/tests/suites/test_suite_entropy.function
index d9ea441..8869896 100644
--- a/tests/suites/test_suite_entropy.function
+++ b/tests/suites/test_suite_entropy.function
@@ -1,6 +1,6 @@
/* BEGIN_HEADER */
#include "mbedtls/entropy.h"
-#include "mbedtls/entropy_poll.h"
+#include "entropy_poll.h"
#include "mbedtls/md.h"
#include "string.h"