I2C: OMAP2+: Convert omap I2C driver to use feature implementation flags from platform data

This patch eliminates all cpu_...() tests from the OMAP I2C driver.

Instead, it uses the functionality flags in the platform data to make
the decisions about product variations the driver needs to handle.

Cc: patches@linaro.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>
Acked-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Kevin Hilman <khilman@ti.com>