drivers/designware_i2c - add suppor of CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW

drivers/designware_i2c - add suppor of CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW

Since we agreed on legacy implementation of "eeprom_{read|write}"
(http://patchwork.ozlabs.org/patch/295825/) I had to fix/make it work
again DesignWare I2C driver for cases when 1 EEPROM IC fake I2C with
anumber of "built-in" ICs with different chip addresses.

Signed-off-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]>
Cc: Vipin KUMAR <[email protected]>
Cc: Tom Rix <[email protected]>
Cc: Mischa Jonker <[email protected]>
Cc: Kuo-Jung Su <[email protected]>