hardware::KBD4x: Disable clock division

The KBD4x has a set of WS2812 LEDs, which are very picky about timing. To make
them happy (even though we do not use them yet), we need to disable clock
division at startup.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/kaleidoscope/hardware/kbdfans/KBD4x.h

@@ -54,6 +54,10 @@ class KBD4x: public kaleidoscope::hardware::ATMegaKeyboard {
      */
     MCUCR |= (1 << JTD);
     MCUCR |= (1 << JTD);
+
+    // Disable Clock division
+    CLKPR = (1 << CLKPCE);
+    CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0);
   }
 
   ATMEGA_KEYBOARD_CONFIG(