fix implementation issues from SSD1306 clean up, added rotation (#1494)

* moved OLED update task to keymap

* fix splitting render display to keymap

* Added rotation option for OLED, fixed splitting display render update to keymap

* issues with attribute

keyboards/lets_split/keymaps/OLED_sample/config.h

@@ -36,6 +36,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define FLIP_HALF
 
 #define SSD1306OLED
+//#define OLED_ROTATE180
 
 
 #define PREVENT_STUCK_MODIFIERS