fix(trng): Enable TRNG before every read

The BLE stack disables the TRNG every time it access it...

epicardium/modules/hardware.c

@@ -73,11 +73,6 @@ int hardware_early_init(void)
 	 */
 	portexpander_init();
 
-	/*
-	 * RNG
-	 */
-	TRNG_Init(NULL);
-
 	/*
 	 * Buttons
 	 */

epicardium/modules/trng.c

@@ -6,6 +6,7 @@ int epic_trng_read(uint8_t *dest, size_t size)
 	if (dest == NULL)
 		return -EFAULT;
 
+	TRNG_Init(NULL);
 	TRNG_Read(MXC_TRNG, dest, size);
 
 	return 0;