spl: Convert spl_sata_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

@@ -401,10 +401,6 @@ static int spl_load_image(u32 boot_device)
 		return spl_net_load_image(&bootdev);
 #endif
 #endif
-#ifdef CONFIG_SPL_SATA_SUPPORT
-	case BOOT_DEVICE_SATA:
-		return spl_sata_load_image(&bootdev);
-#endif
 #ifdef CONFIG_SPL_BOARD_LOAD_IMAGE
 	case BOOT_DEVICE_BOARD:
 		return spl_board_load_image(&bootdev);

common/spl/spl_sata.c

@@ -20,7 +20,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-int spl_sata_load_image(struct spl_boot_device *bootdev)
+static int spl_sata_load_image(struct spl_boot_device *bootdev)
 {
 	int err;
 	struct blk_desc *stor_dev;
@@ -53,3 +53,4 @@ int spl_sata_load_image(struct spl_boot_device *bootdev)
 
 	return 0;
 }
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_SATA, spl_sata_load_image);

include/spl.h

@@ -187,9 +187,6 @@ int spl_spi_load_image(struct spl_boot_device *bootdev);
 /* Ethernet SPL functions */
 int spl_net_load_image(struct spl_boot_device *bootdev);
 
-/* SATA SPL functions */
-int spl_sata_load_image(struct spl_boot_device *bootdev);
-
 /* SPL FAT image functions */
 int spl_load_image_fat(struct blk_desc *block_dev, int partition,
 		       const char *filename);