i2c: omap: Modify code to work without CONFIG_I2C_HARD

Drop use of this long-deprecated option.

Signed-off-by: Simon Glass <sjg@chromium.org>
Suggested-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2 files changed