[CEC Configuration] Add adb shell command to get/set setting value

(cherry-pick from master)

Usage:
adb shell cmd hdmi_control cec_setting get <setting name>
adb shell cmd hdmi_control cec_setting set <setting name> <new value>

Test: manually
Bug: 179780870
Change-Id: I5fab223bd16672056cdbe60825ff5ca7fd0c882e
1 file changed