uart: Do not turn off module if using UART3 for debug
uart: Do not turn off module if using UART3 for debug

This also fixes the warning "control reaches end of non-void function".

Signed-off-by: Francois Berder <0eabc3e9da54407da074ac08d4217d54f5b94915@imgtec.com>

mtusnio/LetMeCreateIoT,CreatorDev/LetMeCreateIoT,mtusnio/LetMeCreateIoT,mtusnio/LetMeCreateIoT,mtusnio/LetMeCreateIoT,CreatorDev/LetMeCreateIoT,CreatorDev/LetMeCreateIoT,CreatorDev/LetMeCreateIoT