This CL introduces two configuration options which allows a notification
to the power management module that the UART console module is in use
now. If the interval of console module doesn't receive any input message
exceeds expired timeout, the power management module is allowed to enter
sleep/deep sleep state and turn off the clock of console module.
This mechanism gives a window in which the users can organize input
message if CONFIG_PM is enabled.
Signed-off-by: Mulin Chao <mlchao@nuvoton.com>
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