i2c: designware_i2c: Add more registers

Some versions of this peripherals provide more control of the bus
behaviour. Add definitions for these registers.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Jun Chen <ptchentw@gmail.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
1 file changed