i2c: octeon: Fix set SCL recovery function

The set SCL recovery function unconditionally pulls the SCL line low.
Only pull SCL line low according to val parameter.

Signed-off-by: Dmitry Bazhenov <dmitry.bazhenov@auriga.com>
Signed-off-by: Jan Glauber <jglauber@cavium.com>
[Changed commit message]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>