HDMICEC: Make DeviceSelectActionFromPlaybackTest to run with any DUT LA

Edit CEC messages from the message in order to depend on DUT's LA.
This change makes the tests to pass even if the DUT has a LA different
than 4.

Test: atest DeviceSelectActionFromPlaybackTest
Bug: 201644908
Change-Id: I0a597c37affce7b1bfd7bd7b14fcebdc6e888567