[microdroid] Rename the partition name of microdroid_kernel to boot

Bug: 262853105
Test: atest libpvmfw_avb.test
Change-Id: Ic0d1f6b2c1023337a5fa2b8251fb40d80e162f37
diff --git a/pvmfw/avb/Android.bp b/pvmfw/avb/Android.bp
index cbec235..d3a5e4e 100644
--- a/pvmfw/avb/Android.bp
+++ b/pvmfw/avb/Android.bp
@@ -62,7 +62,7 @@
 avb_add_hash_footer {
     name: "test_image_with_one_hashdesc",
     src: ":unsigned_test_image",
-    partition_name: "bootloader",
+    partition_name: "boot",
     private_key: ":pvmfw_sign_key",
     salt: "1111",
 }