app: aboot: Change to load vbmeta, and pass avb for verification.

Change to load vbmeta image from lk framework, and used by avb
for verification.

Change-Id: I254cfa13af894c9dab598b4b948977e461a54dbb
diff --git a/platform/msm_shared/include/dev_tree.h b/platform/msm_shared/include/dev_tree.h
index f6f6003..a9ea7a6 100644
--- a/platform/msm_shared/include/dev_tree.h
+++ b/platform/msm_shared/include/dev_tree.h
@@ -60,6 +60,7 @@
 #define FOUNDRY_ID_MASK           (0x00ff0000)
 #define MAX_SUPPORTED_DTBO_IMG_BUF (8388608)  /* 8MB   8 * 1024 * 1024 */
 #define DTBO_IMG_BUF               (10485760) /* 10MB 10 * 1024 * 1024 */
+#define MAX_SUPPORTED_VBMETA_IMG_BUF (65536)  /* 64 KB 64 * 1024 */
 /*
  * For DTB V1: The DTB entries would be of the format
  * qcom,msm-id = <msm8974, CDP, rev_1>; (3 * sizeof(uint32_t))