Make legacy_or_psa.h public.

As a public header, it should no longer include common.h, just use
build_info.h which is what we actually need anyway.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/tests/suites/test_suite_ecjpake.function b/tests/suites/test_suite_ecjpake.function
index 449b368..47c25e3 100644
--- a/tests/suites/test_suite_ecjpake.function
+++ b/tests/suites/test_suite_ecjpake.function
@@ -1,6 +1,6 @@
 /* BEGIN_HEADER */
 #include "mbedtls/ecjpake.h"
-#include "legacy_or_psa.h"
+#include "mbedtls/legacy_or_psa.h"
 
 #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) && defined(MBEDTLS_HAS_ALG_SHA_256_VIA_MD_OR_PSA)
 static const unsigned char ecjpake_test_x1[] = {