cli: Prepend carriage return to line feed

After c15ff7e9
which removes the prepending carriage return from the drivers
It moves the responsibility of prepending carriage return to the user of
the driver. This patch is adding this logic to the cli.

Co-authored-by: Leandro Belli <leandro.belli@arm.com>
Signed-off-by: Leandro Belli <leandro.belli@arm.com>
Signed-off-by: Mohamed Omar Asaker <mohamed.omarasaker@arm.com>
Change-Id: I67707d7b139e087bef88f9fe490f56ff490d2a92