spl: Convert spl_ubi_load_image() to use linker list

Add a linker list declaration for this method and remove the explicit
switch() code.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

common/spl/spl.c

@@ -384,11 +384,6 @@ static int spl_load_image(u32 boot_device)
 		return loader->load_image(&bootdev);
 
 	switch (boot_device) {
-#ifdef CONFIG_SPL_UBI
-	case BOOT_DEVICE_NAND:
-	case BOOT_DEVICE_ONENAND:
-		return spl_ubi_load_image(&bootdev);
-#else
 #ifdef CONFIG_SPL_NAND_SUPPORT
 	case BOOT_DEVICE_NAND:
 		return spl_nand_load_image(&bootdev);
@@ -397,7 +392,6 @@ static int spl_load_image(u32 boot_device)
 	case BOOT_DEVICE_ONENAND:
 		return spl_onenand_load_image(&bootdev);
 #endif
-#endif
 #ifdef CONFIG_SPL_NOR_SUPPORT
 	case BOOT_DEVICE_NOR:
 		return spl_nor_load_image(&bootdev);

common/spl/spl_ubi.c

@@ -76,3 +76,6 @@ out:
 #endif
 	return ret;
 }
+/* Use priorty 0 so that Ubi will override NAND and ONENAND methods */
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_NAND, spl_ubi_load_image);
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_ONENAND, spl_ubi_load_image);

include/spl.h

@@ -190,9 +190,6 @@ int spl_onenand_load_image(struct spl_boot_device *bootdev);
 /* NOR SPL functions */
 int spl_nor_load_image(struct spl_boot_device *bootdev);
 
-/* UBI SPL functions */
-int spl_ubi_load_image(struct spl_boot_device *bootdev);
-
 /* YMODEM SPL functions */
 int spl_ymodem_load_image(struct spl_boot_device *bootdev);