[fuchsia][fidl] Update names

LLCPP generated names are switching to following our standard coding
style. This CL can only land after:
  https://fuchsia-review.googlesource.com/c/fuchsia/+/514882/

Change-Id: I98da10047d70ac67b679987ecf7bb5dca9c510d2
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/516000
Reviewed-by: Craig Stout <cstout@google.com>
1 file changed