* update keyboards/helix/rev2/keymaps/five_rows/rules.mk: oled selection, led animation selection
* add OLED_UPDATE_INTERVAL support into keyboards/helix/rev2/keymaps/five_rows/oled_display.c
Support for OLED_UPDATE_INTERVAL, even for older types of OLED tasks.
* Add 'HELIX=debug/no-debug' option into 'helix/rev2/keymaps/five_rows/rules.mk'