build: enable code coverage

Enable code coverage for the project. Valgrind not enabled in this
step.

Tested: Verified code coverage step now running.
Change-Id: Ieb3606e5ad

build: enable code coverage

Enable code coverage for the project. Valgrind not enabled in this
step.

Tested: Verified code coverage step now running.
Change-Id: Ieb3606e5ad741fb0dd181f8da594c18258efa6bc
Signed-off-by: Patrick Venture <venture@google.com>

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