Don't include lcd_backlight_hal for emulator

visualizer.mk

@@ -34,8 +34,6 @@ ifdef LCD_BACKLIGHT_ENABLE
 SRC += $(VISUALIZER_DIR)/lcd_backlight.c
 ifndef EMULATOR
 SRC += lcd_backlight_hal.c
-else
-SRC += lcd_backlight_hal_emulator.c
 endif
 UDEFS += -DLCD_BACKLIGHT_ENABLE
 endif