Clean up ISSI driver includes (#7734)

* Clean up ISSI driver includes

* Missed an endif

drivers/issi/is31fl3733.c

@@ -16,18 +16,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifdef __AVR__
-#    include <avr/interrupt.h>
-#    include <avr/io.h>
-#    include <util/delay.h>
-#else
-#    include "wait.h"
-#endif
-
-#include <string.h>
-#include "i2c_master.h"
-#include "progmem.h"
 #include "is31fl3733.h"
+#include "i2c_master.h"
+#include "wait.h"
 
 // This is a 7-bit address, that gets left-shifted and bit 0
 // set to 0 for write, 1 for read (as per I2C protocol)
@@ -168,12 +159,8 @@ void IS31FL3733_init(uint8_t addr, uint8_t sync) {
     // Disable software shutdown.
     IS31FL3733_write_register(addr, ISSI_REG_CONFIGURATION, (sync << 6) | 0x01);
 
-// Wait 10ms to ensure the device has woken up.
-#ifdef __AVR__
-    _delay_ms(10);
-#else
+    // Wait 10ms to ensure the device has woken up.
     wait_ms(10);
-#endif
 }
 
 void IS31FL3733_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {