Fix BUILD.gn on Fuchsia

After fxrev.dev/390754 an fxrev.dev/388763 lands,
static trace engine is moved from //zircon/public to //zircon/system/ulib,
fuchsia.logger FIDL interface is moved to //sdk/fidl.

This change fixes BUILD.gn to reflect the changes above.

Change-Id: I00d758b8bbd794b0e52b38acabf2c44437026028
1 file changed