Revert "Convert ErgoDox EZ to Matrix Lite (qmk#10189)"

This reverts commit 396b86b92d.

keyboards/ergodox_ez/ergodox_ez.h

@@ -24,6 +24,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <stdint.h>
 #include <stdbool.h>
 #include "i2c_master.h"
+#include <util/delay.h>
+
+#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
+#define CPU_16MHz       0x00
 
 #if defined(KEYBOARD_ergodox_ez_glow)
 #    include "glow.h"