spl: Convert spl_onenand_load_image() to use linker list

Add a linker list declaration for this method and remove the explicit
switch() code.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NTom Rini <trini@konsulko.com>

common/spl/spl.c

@@ -384,10 +384,6 @@ static int spl_load_image(u32 boot_device)
 		return loader->load_image(&bootdev);
 
 	switch (boot_device) {
-#ifdef CONFIG_SPL_ONENAND_SUPPORT
-	case BOOT_DEVICE_ONENAND:
-		return spl_onenand_load_image(&bootdev);
-#endif
 #ifdef CONFIG_SPL_NOR_SUPPORT
 	case BOOT_DEVICE_NOR:
 		return spl_nor_load_image(&bootdev);

common/spl/spl_onenand.c

@@ -14,7 +14,7 @@
 #include <asm/io.h>
 #include <onenand_uboot.h>
 
-int spl_onenand_load_image(struct spl_boot_device *bootdev)
+static int spl_onenand_load_image(struct spl_boot_device *bootdev)
 {
 	struct image_header *header;
 	int ret;
@@ -34,3 +34,5 @@ int spl_onenand_load_image(struct spl_boot_device *bootdev)
 
 	return 0;
 }
+/* Use priorty 1 so that Ubi can override this */
+SPL_LOAD_IMAGE_METHOD(1, BOOT_DEVICE_ONENAND, spl_onenand_load_image);

include/spl.h

@@ -181,9 +181,6 @@ struct spl_image_loader {
 		.load_image = __method, \
 	}
 
-/* OneNAND SPL functions */
-int spl_onenand_load_image(struct spl_boot_device *bootdev);
-
 /* NOR SPL functions */
 int spl_nor_load_image(struct spl_boot_device *bootdev);