i2c: designware: Don't set SCL timings and speed mode when in slave mode
According to data sheet SCL timing parameters and DW_IC_CON SPEED mode bits are not used when operating in slave mode. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Tested-by: Luis Oliveira <lolivei@synopsys.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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