fw/drivers: remove stale ALS stub driver build code

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

Author: gmarull

src/fw/drivers/wscript_build

@@ -313,17 +313,6 @@ elif mcu_family in ('STM32F2', 'STM32F4', 'STM32F7'):
             'stm32_stdlib',
         ],
     )
-elif mcu_family in ('NRF52840', 'SF32LB52'):
-    # FIXME(NRF52840,SF32LB52): provide working implementation
-    bld.objects(
-        name='driver_ambient_light',
-        source=[
-            'stubs/ambient_light.c',
-        ],
-        use=[
-            'fw_includes',
-        ],
-    )
 
 if mcu_family in ('STM32F4', 'STM32F7'):
     bld.objects(