i2c: omap: use revision check for OMAP_I2C_FLAG_APPLY_ERRATA_I207

The errata i207 is enabled for 2430 and 3xxx. Use the revision check
to enable the erratum instead.

Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>