Detect SOC type and use detected SOC type to init the hardware.

Detect the SOC type and variant. RTL8372 vs RTL8373 and also is it as
non-N/N variant of the SOC.
Even if the machine profile is wrong the hardware will be initilised on
the detected type.

machine.h

@@ -38,4 +38,10 @@ typedef struct machine {
 	int8_t reset_pin;
 };
 
+typedef struct machine_runtime
+{
+	uint8_t isRTL8373 : 1;
+	uint8_t isN : 1;
+};
+
 #endif