bootm: Support android boot on sandbox

A small change allows this to operate on sandbox.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/bootm.c b/common/bootm.c
index 338f647..1e66929 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -793,7 +793,7 @@
 #ifdef CONFIG_ANDROID_BOOT_IMAGE
 	case IMAGE_FORMAT_ANDROID:
 		printf("## Booting Android Image at 0x%08lx ...\n", img_addr);
-		if (android_image_get_kernel((void *)img_addr, images->verify,
+		if (android_image_get_kernel(buf, images->verify,
 					     os_data, os_len))
 			return NULL;
 		break;