[roll] Roll fuchsia [as370][emmc] Add defines for eMMC on AS370

Add defines for the second SDHCI controller on AS370. This controller is
designated for eMMC, so update the DID check in SDHCI so that the
appropriate quirks value is used.

Test: CQ
Original-Bug: 110592
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/731741
Original-Revision: 6345083658b6fa71e5f7ee6ead3ac7f3f4bbcda6
GitOrigin-RevId: 025a7065dc88ad1857a7745a84e04db2056dd836
Change-Id: I20b5834a948a0a7a113ff868449551714eea09bc
diff --git a/stem b/stem
index 94d4881..f9eb94b 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="e914c9abc957d995eb1f39596e5a464074ee3a92"/>
+             revision="6345083658b6fa71e5f7ee6ead3ac7f3f4bbcda6"/>
   </projects>
   <hooks>
     <hook name="install-environment"