[Keymap] Change helix:five_rows_jis keymap to use split_common (#16538)

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

@@ -1,4 +1,5 @@
 LTO_ENABLE = no  # if firmware size over limit, try this option
+SPLIT_KEYBOARD = yes
 
 # Helix Spacific Build Options
 # you can uncomment and edit follows 7 Variables
@@ -10,3 +11,11 @@ HELIX_ROWS = 5              # Helix Rows is 4 or 5
 # LED_UNDERGLOW_ENABLE = no   # LED underglow (Enable WS2812 RGB underlight.)
 # LED_ANIMATIONS = yes        # LED animations
 # IOS_DEVICE_ENABLE = no      # connect to IOS device (iPad,iPhone)
+
+# OLED_ENABLE が yes のとき
+#   OLED_SELECT が core ならば QMK 標準の oled_dirver.c を使用します。
+#   OLED_SELECT が core 以外ならば従来どおり helix/local_drivers/ssd1306.c を使用します。
+# If OLED_ENABLE is 'yes'
+#   If OLED_SELECT is 'core', use QMK standard oled_dirver.c.
+#   If OLED_SELECT is other than 'core', use helix/local_drivers/ssd1306.c.
+OLED_SELECT = core