RSE: Minimize size of builtin key slots

Use only required size.

Change-Id: I1d972f16f78c0adb89621f3a7d4332961b0040ef
Signed-off-by: Raef Coles <[email protected]>

Author: RcColes

platform/ext/target/arm/rse/common/platform_builtin_key_loader_ids.h

@@ -9,12 +9,13 @@
 #define __PLATFORM_BUILTIN_KEY_LOADER_IDS_H__
 
 #include "rse_rotpk_config.h"
+#include "rse_otp_config.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#define TFM_BUILTIN_MAX_KEY_LEN 96
+#define TFM_BUILTIN_MAX_KEY_LEN RSE_OTP_ROTPK_MAX_SIZE
 
 enum psa_drv_slot_number_t {
     TFM_BUILTIN_KEY_SLOT_HUK = 0,

platform/ext/target/arm/rse/common/subplatform_pal_default_config/rse_otp_config.h

@@ -56,6 +56,9 @@
 #define RSE_OTP_CONFIG_PROVISIONING_DM_SIGN_KEY_CM_ROTPK_HASH_ALG_SIZE (0)
 #endif /* RSE_PROVISIONING_DM_SIGN_KEY_CM_ROTPK_HASH_ALG */
 
+#define RSE_OTP_ROTPK_MAX_SIZE \
+    (RSE_OTP_CONFIG_MAX_SIZE_OF_THREE(RSE_OTP_CM_ROTPK_SIZE, RSE_OTP_DM_ROTPK_SIZE, 0))
+
 #define RSE_OTP_CM_ROTPK_SIZE                                                                     \
     (RSE_OTP_CONFIG_MAX_SIZE_OF_THREE(                                                            \
         RSE_OTP_CONFIG_TFM_BL1_2_ROTPK_HASH_ALG_SIZE, RSE_OTP_CONFIG_MCUBOOT_ROTPK_HASH_ALG_SIZE, \