i2c: designware: Discard i2c_dw_read_comp_param() function

There is no code left in the kernel which would be using the function.
So just remove it.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-designware-common.c

@@ -388,11 +388,5 @@ void i2c_dw_disable_int(struct dw_i2c_dev *dev)
 	dw_writel(dev, 0, DW_IC_INTR_MASK);
 }
 
-u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev)
-{
-	return dw_readl(dev, DW_IC_COMP_PARAM_1);
-}
-EXPORT_SYMBOL_GPL(i2c_dw_read_comp_param);
-
 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter core");
 MODULE_LICENSE("GPL");

drivers/i2c/busses/i2c-designware-core.h

@@ -314,7 +314,6 @@ static inline void __i2c_dw_disable_nowait(struct dw_i2c_dev *dev)
 
 void __i2c_dw_disable(struct dw_i2c_dev *dev);
 
-extern u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev);
 extern int i2c_dw_probe(struct dw_i2c_dev *dev);
 #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_SLAVE)
 extern int i2c_dw_probe_slave(struct dw_i2c_dev *dev);