Reinstate global `k_rgb_matrix_split` (#24388)

quantum/led_matrix/led_matrix.c

@@ -387,7 +387,6 @@ struct led_matrix_limits_t led_matrix_get_limits(uint8_t iter) {
     limits.led_min_index = LED_MATRIX_LED_PROCESS_LIMIT * (iter);
     limits.led_max_index = limits.led_min_index + LED_MATRIX_LED_PROCESS_LIMIT;
     if (limits.led_max_index > LED_MATRIX_LED_COUNT) limits.led_max_index = LED_MATRIX_LED_COUNT;
-    uint8_t k_led_matrix_split[2] = LED_MATRIX_SPLIT;
     if (is_keyboard_left() && (limits.led_max_index > k_led_matrix_split[0])) limits.led_max_index = k_led_matrix_split[0];
     if (!(is_keyboard_left()) && (limits.led_min_index < k_led_matrix_split[0])) limits.led_min_index = k_led_matrix_split[0];
 #    else
@@ -397,9 +396,8 @@ struct led_matrix_limits_t led_matrix_get_limits(uint8_t iter) {
 #    endif
 #else
 #    if defined(LED_MATRIX_SPLIT)
-    limits.led_min_index                = 0;
-    limits.led_max_index                = LED_MATRIX_LED_COUNT;
-    const uint8_t k_led_matrix_split[2] = LED_MATRIX_SPLIT;
+    limits.led_min_index = 0;
+    limits.led_max_index = LED_MATRIX_LED_COUNT;
     if (is_keyboard_left() && (limits.led_max_index > k_led_matrix_split[0])) limits.led_max_index = k_led_matrix_split[0];
     if (!(is_keyboard_left()) && (limits.led_min_index < k_led_matrix_split[0])) limits.led_min_index = k_led_matrix_split[0];
 #    else

quantum/rgb_matrix/rgb_matrix.c

@@ -83,6 +83,11 @@ static uint32_t rgb_timer_buffer;
 static last_hit_t last_hit_buffer;
 #endif // RGB_MATRIX_KEYREACTIVE_ENABLED
 
+// split rgb matrix
+#if defined(RGB_MATRIX_SPLIT)
+const uint8_t k_rgb_matrix_split[2] = RGB_MATRIX_SPLIT;
+#endif
+
 EECONFIG_DEBOUNCE_HELPER(rgb_matrix, EECONFIG_RGB_MATRIX, rgb_matrix_config);
 
 void eeconfig_update_rgb_matrix(void) {
@@ -399,7 +404,6 @@ struct rgb_matrix_limits_t rgb_matrix_get_limits(uint8_t iter) {
     limits.led_min_index = RGB_MATRIX_LED_PROCESS_LIMIT * (iter);
     limits.led_max_index = limits.led_min_index + RGB_MATRIX_LED_PROCESS_LIMIT;
     if (limits.led_max_index > RGB_MATRIX_LED_COUNT) limits.led_max_index = RGB_MATRIX_LED_COUNT;
-    uint8_t k_rgb_matrix_split[2] = RGB_MATRIX_SPLIT;
     if (is_keyboard_left() && (limits.led_max_index > k_rgb_matrix_split[0])) limits.led_max_index = k_rgb_matrix_split[0];
     if (!(is_keyboard_left()) && (limits.led_min_index < k_rgb_matrix_split[0])) limits.led_min_index = k_rgb_matrix_split[0];
 #    else
@@ -409,9 +413,8 @@ struct rgb_matrix_limits_t rgb_matrix_get_limits(uint8_t iter) {
 #    endif
 #else
 #    if defined(RGB_MATRIX_SPLIT)
-    limits.led_min_index                = 0;
-    limits.led_max_index                = RGB_MATRIX_LED_COUNT;
-    const uint8_t k_rgb_matrix_split[2] = RGB_MATRIX_SPLIT;
+    limits.led_min_index = 0;
+    limits.led_max_index = RGB_MATRIX_LED_COUNT;
     if (is_keyboard_left() && (limits.led_max_index > k_rgb_matrix_split[0])) limits.led_max_index = k_rgb_matrix_split[0];
     if (!(is_keyboard_left()) && (limits.led_min_index < k_rgb_matrix_split[0])) limits.led_min_index = k_rgb_matrix_split[0];
 #    else