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/library/entropy_poll.c b/library/entropy_poll.c
index a3200d9..4fbe1ee 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -29,7 +29,7 @@
#if defined(MBEDTLS_ENTROPY_C)
#include "mbedtls/entropy.h"
-#include "mbedtls/entropy_poll.h"
+#include "entropy_poll.h"
#include "mbedtls/error.h"
#if defined(MBEDTLS_TIMING_C)