spl: Fix compilation warnings for arm64

Make code 64bit aware.

Warnings:
+../arch/arm/lib/spl.c: In function ‘jump_to_image_linux’:
+../arch/arm/lib/spl.c:63:3: warning: cast to pointer from integer of
different size [-Wint-to-pointer-cast]
+../common/spl/spl_fat.c: In function ‘spl_load_image_fat’:
+../common/spl/spl_fat.c:91:33: warning: cast to pointer from integer
of different size [-Wint-to-pointer-cast]

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/lib/spl.c

@@ -60,7 +60,7 @@ void __noreturn jump_to_image_linux(void *arg)
 	typedef void (*image_entry_arg_t)(int, int, void *)
 		__attribute__ ((noreturn));
 	image_entry_arg_t image_entry =
-		(image_entry_arg_t) spl_image.entry_point;
+		(image_entry_arg_t)(uintptr_t) spl_image.entry_point;
 	cleanup_before_linux();
 	image_entry(0, machid, arg);
 }

common/spl/spl_fat.c

@@ -88,7 +88,8 @@ int spl_load_image_fat(struct blk_desc *block_dev,
 		if (err)
 			goto end;
 
-		err = file_fat_read(filename, (u8 *)spl_image.load_addr, 0);
+		err = file_fat_read(filename,
+				    (u8 *)(uintptr_t)spl_image.load_addr, 0);
 	}
 
 end: