designware_i2c: Enhance DesignWare I2C driver address support

designware_i2c: Enhance DesignWare I2C driver address support

Enhance the DesignWare I2C driver to support address length more
than 1 byte. This enhancement is required as some I2C slave
device such as EEPROM chip might have 16 bit address byte.

Signed-off-by: Chin Liang See <[email protected]>
Acked-by: Alexey Brodkin <[email protected]>
Cc: Tom Rini <[email protected]>
cc: Armando Visconti <[email protected]>
Cc: Stefan Roese <[email protected]>
Cc: Albert ARIBAUD <[email protected]>
Cc: Heiko Schocher <[email protected]>