platform: stm: remove gtzc_periph_att when unused

Combine the #ifdef clauses of the gtzc_periph_att usages
to only instantiate the variable when it is actually used.

This fixes the -Wunused-variable warning:

/platform/ext/target/stm/common/stm32h5xx/secure/target_cfg.c:480:12:
warning: unused variable 'gtzc_periph_att' [-Wunused-variable]
  480 |   uint32_t gtzc_periph_att;
      |            ^~~~~~~~~~~~~~~

Change-Id: I04e4eebedf791e76f943557633338c115164e410
Signed-off-by: Stefan Gloor <[email protected]>
(cherry picked from commit c91f4e60f112e3f63aa35f197f00112e0d43cd7f)
Signed-off-by: Tim Pambor <[email protected]>

Author: tpambor

platform/ext/target/stm/common/stm32h5xx/secure/target_cfg.c

@@ -477,7 +477,17 @@ static void gtzc_internal_flash_priv(uint32_t offset_start, uint32_t offset_end)
 
 void gtzc_init_cfg(void)
 {
+#if (defined (MBEDTLS_SHA256_C) && defined (MBEDTLS_SHA256_ALT)) \
+ || (defined (MBEDTLS_SHA1_C) && defined (MBEDTLS_SHA1_ALT)) \
+ || (defined (MBEDTLS_MD5_C) && defined (MBEDTLS_MD5_ALT)) \
+ || (defined (MBEDTLS_ECP_C) && defined (MBEDTLS_ECP_ALT)) \
+ || (defined (MBEDTLS_ECDSA_C) && (defined (MBEDTLS_ECDSA_SIGN_ALT) || defined (MBEDTLS_ECDSA_VERIFY_ALT))) \
+ || (defined (MBEDTLS_AES_C) && defined (MBEDTLS_AES_ALT)) \
+ || (defined (MBEDTLS_GCM_C) && defined (MBEDTLS_GCM_ALT)) \
+ || (defined (MBEDTLS_CCM_C) && defined (MBEDTLS_CCM_ALT)) \
+ || defined (HW_CRYPTO_DPA_AES) || defined (HW_CRYPTO_DPA_GCM)
   uint32_t gtzc_periph_att;
+#endif
 
   if (uFlowStage == FLOW_STAGE_CFG)
   {