servo: lucid: rename cpu_uart to ec_uart.

Lucid uses the cosmos flex to connect to servo but with its EC uart
connected to uart2 (cpu).  This CL renames those controls to 'ec_uart_'
such that automated scripts (flash_ec) and developers can locate the
proper uart.

BUG=chrome-os-partner:43619
TEST=manual
1. launch servod
  sudo servod -b lucid
2. verify that both cpu & ec uart controls map to same control (interface 8)
  dut-control -i | egrep -A 2 "(cpu|ec)_uart_(pty|parity|buadrate|bits|sbits|en)"

Change-Id: Ifbf7681703d9cf06482ec2038c3ce6070a76fcce
Reviewed-on: https://chromium-review.googlesource.com/291381
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Todd Broch <tbroch@chromium.org>
Tested-by: Todd Broch <tbroch@chromium.org>
1 file changed