[roll] Roll fuchsia [intel-i915-tgl] Unit tests for registers::CdClockCtl logic.

registers::CdClockCtl::FreqDecimal() has non-trivial logic. Intel's PRMs
include a good number of test cases we can use to validate this logic.

Tested: fx test //src/graphics/display/drivers/intel-i915-tgl
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/704882
Original-Revision: 8bdd66c8665231ff1433f5014a96d8dc5f1fa705
GitOrigin-RevId: e955bef6e8f50c11a2703082e2809a8b5a250ab0
Change-Id: I7eb3e59d81f6d4ada7444008d8852418feff5f3b

stem

diff --git a/stem b/stem
index abe45c7..9eaf18e 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
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-             revision="924b98c27ec3cb801944ae9746846e641c84ff03"/>
+             revision="8bdd66c8665231ff1433f5014a96d8dc5f1fa705"/>
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