[roll] Roll fuchsia [super_parser] Helper function to round to the nearest alignment

Add and use helper function to round to the nearest block alignment.
Use this to ensure read from fake device is block-aligned.

Original-Bug: 404952286
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1269405
Original-Revision: 7c08cd5ca2ce3651bde69d702ea4740d84cd23d1
GitOrigin-RevId: c2bb6a7425a74a7659df1ed2b1e318f65029d779
Change-Id: Ib199679cf5ed290697e3bd5ba9e20215e8485972
diff --git a/stem b/stem
index ac0c7c1..3708954 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="70f49d85bf82917d6f4cdf44d5364ad166a2b7f7"
+             revision="7c08cd5ca2ce3651bde69d702ea4740d84cd23d1"
              />
   </imports>
   <projects>