[roll] Roll zircon d55d9db7..daec3be2 (9 commits)

daec3be2 [display] Make edid presence check consistent
a834e814 [build] USE_LINKER_GC -> USER_USE_LINKER_GC, KERNEL_USE_LINKER_GC
fc9cc395 [kernel][vm] Make EnumerateChildren use iteration
4956d002 [utest] Remove empty-string "msg" args from EXPECT/ASSERT calls in C++
59cc5745 [intel-i915] Clean up ddi configuration
21358569 [virtcon] Fix incorrect usage of display_id
afa085e7 [intel-i915] Don't detach pipe when changing mode
12eabf34 [display] Don't try to populate timings with no edid
95082b71 [zx] Add Debug Register State

Test: CQ

Change-Id: I23ceefae0af742ded341951db836094986ceca85