[roll] Roll fuchsia [designware-dsi] Add converter and check functions for DPI interface video timing.

This adds helper methods to convert pixel durations to D-PHY lane byte
clock cycles used in the DSI Host Controller.

This also adds a helper method IsValidDpiVideoTiming() to check if a
given display::DisplayTiming object is valid for the DPI interface
input.

Test: dsi-host-controller-tests
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1002231
Original-Revision: 8acaad63d8aa8dfa886248dbef086a0e733a90c7
GitOrigin-RevId: f892c772dd58e09156e5558256fd2a83c9f0ce25
Change-Id: Ibf98850afc96e4755ceecb1fcabf14b0840234bf

stem

diff --git a/stem b/stem
index 37514b6..5a07bea 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
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-             revision="65e4c64f3e5344d664c6882164bddc3e665d2e81"/>
+             revision="8acaad63d8aa8dfa886248dbef086a0e733a90c7"/>
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