drivers: gpio: PCF857x: Modify PCF8574 driver
Modify existing PCF8574 driver as PCF857x for:
PCF8574 - 8 channel I/O expander
PCF8575 - 16 channel I/O expander
Signed-off-by:
Amrith Venkat Kesavamoorthi <amrith@mr-beam.org>
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