[Keymap] Helix default keymap oled update (#11152)

* update keyboards/helix/rev2/local_features.mk - Improved parsing of the `HELIX =` option

* add 'is_mac_mode()' into keyboards/helix/rev2/rev2.c

* update helix/rev2/keymaps/default/keymap.c: use rgblight query functions

* Makes the OLED driver used by the helix:default keymap switchable.

* use TOP/drivers/oled/oled_driver.c
  `make  helix:default`
  or
  `make OLED_SELECT=core  helix:default`
* use helix/local_drivers/ssd1306.c
  `make OLED_SELECT=local  helix:default`

* Separated the OLED related code from keymap.c and moved it to oled_display.c.

* Change the 'led_test' keymap to follow the changes in the 'default' keymap.

* update helix/rev2/keymaps/default/oled_display.c

* add '#define OLED_UPDATE_INTERVAL 50' into keyboards/helix/rev2/config.h

* Support for OLED_UPDATE_INTERVAL, even for older types of OLED tasks

* add readme.md for helix/rev2

* Apply drashna's suggestions to rev2.c.

* Apply drashna's suggestions to rev3_4rows.c, rev3_5rows.c.

Co-authored-by: mtei <2170248+mtei@users.noreply.github.com>

0 files changed, 0 insertions, 0 deletions