I2C: OMAP1: set i2c unit feature implementation flags in platform data

Most of the OMAP1 implementation flags are set statically, with the
exception that omap7xx has its data bus wired up differently.

Cc: patches@linaro.org
Cc: Ben Dooks <ben-linux@fluff.org>
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andy Green <andy.green@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>