desolve machine_init.c similar to what we did for machine.c

machine/ZX310S_4T2XT_init.c

@@ -0,0 +1,8 @@
+#include "machine_init_defs.h"
+
+void machine_custom_init(void) __banked
+{
+	// For this device, the reset value of RTL837X_PIN_MUX_0 is 0x30000000,
+	// which would disables all LEDS, enable them manually:
+	REG_SET(RTL837X_PIN_MUX_0, 0x30db68bf);
+}