serial: sh-sci: Add calculation recive margin for HSCIF

serial: sh-sci: Add calculation recive margin for HSCIF

When the error of the same bit rate is detected, we will need to select
the recive margin is large. Current code holds the minimum error, it does
not have to check the recive margin. This adds this calculation.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 730c4e782c039caf40b467c35f595c005e94220c)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>