arm: omap_i2c: Remove unwanted header file inclusion

There is no need for to include this header here, so drop it.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>