[ci] vivado build timeout extended to 3 hours

I hit a 2hr timeout with a vivado build so I'm extending it to make CI
less flaky

Signed-off-by: Drew Macrae <drewmacrae@google.com>
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 391e36e..947d64b 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -326,7 +326,7 @@
     - cw310_sw_build
   condition: and(succeeded(), eq(dependencies.lint.outputs['DetermineBuildType.onlyDocChanges'], '0'), eq(dependencies.lint.outputs['DetermineBuildType.onlyDvChanges'], '0'))
   pool: ci-public
-  timeoutInMinutes: 120 # 2 hours
+  timeoutInMinutes: 180
   steps:
   - template: ci/install-package-dependencies.yml
   - template: ci/download-artifacts-template.yml