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C++ aggregate initializers will only initializer the first member
of a union, which in the case of v4l2_format leaves a lot of data
uninitialized. Fix this by initializing it with memset().

BUG=chromium:1068447
BUG=b:153935975
TEST=VDAtest passes on nyan_kitty.

Change-Id: I7138b49780a9845ea924be00f11ccaa7a6904f6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147399Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758854}