Implement adb command to send vendor commands

adb shell cmd hdmi_control vendorcommand <args> will send an HDMI-CEC
vendor command to a target device.
This equals a call to HdmiClient#sendVendorCommand.

Bug: 173182293
Test: adb shell cmd hdmi_control vendorcommand; verify with cec-adapter

Change-Id: Ie19ab05665be7c9e76fcd70634c13fcb202e2459
1 file changed