Use only `MBEDTLS_ECP_WITH_MPI_UINT` to switch between the ecp variants

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/library/ecp_new.c b/library/ecp_new.c
index 3df6f9f..028a33b 100644
--- a/library/ecp_new.c
+++ b/library/ecp_new.c
@@ -43,8 +43,6 @@
 
 #include "common.h"
 
-#include "ecp_invasive.h"
-
 #if defined(MBEDTLS_ECP_WITH_MPI_UINT)
 
 /**
@@ -84,6 +82,7 @@
 #include "mbedtls/error.h"
 
 #include "bn_mul.h"
+#include "ecp_invasive.h"
 
 #include <string.h>