Helix keyboard led test as a keymap (#2513)

* duplicate keyboards/helix/rev2/keymaps/default to keyboards/helix/rev2/keymaps/led_test

* OLED & RGB LED on

* duplicate quantum/rgblight.[ch] to keyboards/helix/rev2/keymaps/led_test

* rgblight.c modify for RGB test

keyboards/helix/rev2/keymaps/led_test/rules.mk

@@ -0,0 +1,38 @@
+
+# Build Options
+#   change to "no" to disable the options, or define them in the Makefile in
+#   the appropriate keymap folder that will get included automatically
+#
+BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration(+1000)
+MOUSEKEY_ENABLE = no       # Mouse keys(+4700)
+EXTRAKEY_ENABLE = no       # Audio control and System control(+450)
+CONSOLE_ENABLE = no         # Console for debug(+400)
+COMMAND_ENABLE = no        # Commands for debug and configuration
+NKRO_ENABLE = no            # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+BACKLIGHT_ENABLE = no      # Enable keyboard backlight functionality
+MIDI_ENABLE = no            # MIDI controls
+AUDIO_ENABLE = no           # Audio output on port C6
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+# Helix keyboard : see ./config.h: RGBLED_NUM 6 or 32
+# Helix keyboard : RGBLIGHT_ENABLE = no or yes
+RGBLIGHT_ENABLE = yes-but-local        # Enable WS2812 RGB underlight.  Do not enable this with audio at the same time.
+ONEHAND_ENABLE = no        # Enable one-hand typing
+
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
+
+ifndef QUANTUM_DIR
+	include ../../../../Makefile
+endif
+
+#copy from common_features.mk and modify rgblight.c
+    OPT_DEFS += -DRGBLIGHT_ENABLE
+    SRC += rgblight.c
+    CIE1931_CURVE = yes
+    LED_BREATHING_TABLE = yes
+    ifeq ($(strip $(RGBLIGHT_CUSTOM_DRIVER)), yes)
+        OPT_DEFS += -DRGBLIGHT_CUSTOM_DRIVER
+    else
+         SRC += ws2812.c
+    endif