Increment AVF rollback indices for 25Q2

Bumping rollback_index of Microdroid kernel is critical to the rollback
protection story of Microdroid based VM, same is true for service_vm
kernel.  In addition to these, it is neater to bump the version of each
apex on significant releases.

Test: Builds
Bug: 392895864
Change-Id: I0104e6ff646ac3d54ba10322fd1839f37f11cae1
diff --git a/build/microdroid/Android.bp b/build/microdroid/Android.bp
index 10b492b..9152091 100644
--- a/build/microdroid/Android.bp
+++ b/build/microdroid/Android.bp
@@ -506,7 +506,7 @@
     },
 }
 
-MICRODROID_GKI_ROLLBACK_INDEX = 1
+MICRODROID_GKI_ROLLBACK_INDEX = 2
 
 flag_aware_avb_add_hash_footer_defaults {
     name: "microdroid_kernel_cap_defaults",