[roll] Roll fuchsia [goldfish] Add GOLDFISH_OPTIMAL format modifier to Display frame buffer.

For each format, sysmem treats the format with linear modifier
and goldfish optimal modifier as two different formats, and all
clients should have a shared format.

In Escher and goldfish Vulkan  driver, we've specified that both
LINEAR and GOLDFISH_FORMAT modifier can be used for a display
frame buffer image, thus we need to do the same thing in the
display driver.

TEST=scenic_pixeltest works after we switch to goldfish optimal
     format in goldfish Vulkan driver.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/479677
Original-Revision: 703c87ad0d86a55fe1c66585835084bbc0267efd
GitOrigin-RevId: f4cba9d1193a0421169793425544366b37234973
Change-Id: I3e571efb475178f2c982d14bedca8c4704b7455b
diff --git a/stem b/stem
index ca2880b..ac849a7 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
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-             revision="f8361100ca6f367412ff12905a98819d50a58147"/>
+             revision="703c87ad0d86a55fe1c66585835084bbc0267efd"/>
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