settings: restore zero_init attribute for config_ram (#901)

Author: mathias-arm

source/daplink/settings/settings.c

@@ -66,7 +66,12 @@ typedef struct __attribute__((__packed__)) cfg_ram {
 COMPILER_ASSERT((offsetof(cfg_ram_t, hexdump) % sizeof(uint32_t)) == 0);
 
 // Configuration RAM
+#if defined(__ARMCC)
+static cfg_ram_t config_ram __attribute__((section("cfgram"), zero_init));
+#else
 static cfg_ram_t config_ram __attribute__((section("cfgram")));
+#endif
+
 // Ram copy of RAM config
 static cfg_ram_t config_ram_copy;