W25QXX SPI Flash support (#18897)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/lcd/extui/lib/mks_ui/pic_manager.h

@@ -23,6 +23,8 @@
 
 #include "../../../../inc/MarlinConfig.h"
 
+#include "../../../../libs/W25Qxx.h"
+
 #include <lvgl.h>
 
 #include <stdint.h>
@@ -154,6 +156,8 @@ extern void spi_flash_read_test();
 extern void default_view_Read(uint8_t *default_view_Rbuff, uint32_t default_view_Readsize);
 extern void flash_view_Read(uint8_t *flash_view_Rbuff, uint32_t flash_view_Readsize);
 
+extern W25QXXFlash W25QXX;
+
 #ifdef __cplusplus
 } /* C-declarations for C++ */
 #endif