Use posix_memalign() for pnf_p7_t creation

Some L1 functions might get a pointer to P7 structures, and use SIMD in
which case the memory access needs to be aligned.

nfapi/open-nFAPI/pnf/src/pnf_p7_interface.c

@@ -21,9 +21,10 @@
 
 nfapi_pnf_p7_config_t* nfapi_pnf_p7_config_create()
 {
-	pnf_p7_t* _this = (pnf_p7_t*)calloc(1, sizeof(pnf_p7_t));
+  pnf_p7_t* _this = NULL;
+  int rc = posix_memalign((void**)&_this, 32, sizeof(pnf_p7_t));
 
-	if(_this == 0)
+  if (_this == NULL || rc != 0)
     return 0;