* Clean up some FPGA code

* Wrap sampling phase setting
* Enable hal.enable_lightweight_device_driver_api to reduce CPU code size

software/sys_controller_bsp/public.mk

@@ -191,7 +191,8 @@ ALT_CPPFLAGS += -DALT_NO_EXIT
 # devices. If true, adds -DALT_USE_DIRECT_DRIVERS to ALT_CPPFLAGS in public.mk. 
 # The Altera Host and read-only ZIP file systems can't be used if 
 # hal.enable_lightweight_device_driver_api is true. 
-# setting hal.enable_lightweight_device_driver_api is false
+# setting hal.enable_lightweight_device_driver_api is true
+ALT_CPPFLAGS += -DALT_USE_DIRECT_DRIVERS
 
 # Adds code to emulate multiply and divide instructions in case they are 
 # executed but aren't present in the CPU. Normally this isn't required because