Add an explicit dependency on device_serial_mojo to battor agent.
Add an explicit dependency on device_serial_mojo to battor agent.

BUG=564667

Review URL: https://codereview.chromium.org/1511753004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#364457}

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